diff --git a/examples/abc054-c.rs b/examples/abc054-c.rs
new file mode 100644
index 0000000..63d8f99
--- /dev/null
+++ b/examples/abc054-c.rs
@@ -0,0 +1,55 @@
+// https://atcoder.jp/contests/abc054/tasks/abc054_c
+
+use petgraph::csr::Csr;
+use petgraph::Undirected;
+
+fn main() {
+    // use std::io::{self, Read as _};
+    //
+    // let mut input = "".to_owned();
+    // io::stdin().read_to_string(&mut input).unwrap();
+    // let mut input = input.split_whitespace();
+    // macro_rules! read {
+    //     ([$t:tt; $n:expr]) => {
+    //         (0..$n).map(|_| read!($t)).collect::<Vec<_>>()
+    //     };
+    //     (($($t:tt),+)) => {
+    //         ($(read!($t)),*)
+    //     };
+    //     (_1based) => {
+    //         read!(usize) - 1
+    //     };
+    //     (_bytes) => {
+    //         read!(String).into_bytes()
+    //     };
+    //     ($ty:ty) => {
+    //         input.next().unwrap().parse::<$ty>().unwrap()
+    //     };
+    // }
+    //
+    // let (n, m) = read!((usize, usize));
+    // let mut abs = read!([(_1based, _1based); m]);
+
+    use proconio::input;
+    use proconio::marker::Usize1;
+
+    input! {
+        n: usize,
+        m: usize,
+        mut abs: [(Usize1, Usize1); m],
+    }
+
+    abs.sort();
+    let mut g = Csr::<(), (), Undirected, usize>::with_nodes(n);
+    for (a, b) in abs {
+        g.add_edge(a, b, ());
+    }
+    let mut ans = 0;
+    let mut es = (0..n).collect::<Vec<_>>();
+    permutohedron::heap_recursive(&mut es, |es| {
+        if es[0] == 0 && es.windows(2).all(|w| g.contains_edge(w[0], w[1])) {
+            ans += 1;
+        }
+    });
+    println!("{}", ans);
+}
diff --git a/examples/abc084-d.rs b/examples/abc084-d.rs
new file mode 100644
index 0000000..2a06584
--- /dev/null
+++ b/examples/abc084-d.rs
@@ -0,0 +1,52 @@
+// https://atcoder.jp/contests/abc084/tasks/abc084_d
+
+use itertools_num::ItertoolsNum as _;
+use primal::Sieve;
+
+#[proconio::fastout]
+fn main() {
+    // use std::io::{self, Read as _};
+    //
+    // let mut input = "".to_owned();
+    // io::stdin().read_to_string(&mut input).unwrap();
+    // let mut input = input.split_whitespace();
+    // macro_rules! read {
+    //     ([$t:tt; $n:expr]) => {
+    //         (0..$n).map(|_| read!($t)).collect::<Vec<_>>()
+    //     };
+    //     (($($t:tt),+)) => {
+    //         ($(read!($t)),*)
+    //     };
+    //     (_1based) => {
+    //         read!(usize) - 1
+    //     };
+    //     (_bytes) => {
+    //         read!(String).into_bytes()
+    //     };
+    //     ($ty:ty) => {
+    //         input.next().unwrap().parse::<$ty>().unwrap()
+    //     };
+    // }
+    //
+    // let q = read!(usize);
+    // let lrs = read!([(usize, usize); q]);
+
+    use proconio::input;
+
+    input! {
+        q: usize,
+        lrs: [(usize, usize); q],
+    }
+
+    // サンプルケースでしか試してないので嘘かもしれない。
+
+    let hi = lrs.iter().map(|&(_, r)| r).max().unwrap();
+    let sieve = Sieve::new(hi);
+    let nums = (0..=hi)
+        .map(|k| u32::from(sieve.is_prime(k) && sieve.is_prime((k + 1) / 2)))
+        .cumsum()
+        .collect::<Vec<u32>>();
+    for (l, r) in lrs {
+        println!("{}", nums[r] - nums[l - 1]);
+    }
+}
diff --git a/examples/abc142-d.rs b/examples/abc142-d.rs
new file mode 100644
index 0000000..a8fdb4e
--- /dev/null
+++ b/examples/abc142-d.rs
@@ -0,0 +1,53 @@
+// https://atcoder.jp/contests/abc142/tasks/abc142_d
+
+use primal::Sieve;
+
+use std::cmp::max;
+use std::collections::HashSet;
+
+fn main() {
+    // use std::io::{self, Read as _};
+    //
+    // let mut input = "".to_owned();
+    // io::stdin().read_to_string(&mut input).unwrap();
+    // let mut input = input.split_whitespace();
+    // macro_rules! read {
+    //     ([$t:tt; $n:expr]) => {
+    //         (0..$n).map(|_| read!($t)).collect::<Vec<_>>()
+    //     };
+    //     (($($t:tt),+)) => {
+    //         ($(read!($t)),*)
+    //     };
+    //     (_1based) => {
+    //         read!(usize) - 1
+    //     };
+    //     (_bytes) => {
+    //         read!(String).into_bytes()
+    //     };
+    //     ($ty:ty) => {
+    //         input.next().unwrap().parse::<$ty>().unwrap()
+    //     };
+    // }
+    //
+    // let (n, m) = read!((usize, usize));
+
+    use proconio::input;
+
+    input! {
+        a: usize,
+        b: usize,
+    }
+
+    // サンプルケースでしか試してないので嘘かもしれない。
+
+    let sieve = Sieve::new(num_integer::sqrt(max(a, b)));
+    let bases = |k| -> HashSet<_> {
+        sieve
+            .factor(k)
+            .unwrap()
+            .into_iter()
+            .map(|(p, _)| p)
+            .collect()
+    };
+    println!("{}", (&bases(a) & &bases(b)).len() + 1);
+}
diff --git a/examples/apg4b-ex25.rs b/examples/apg4b-ex25.rs
new file mode 100644
index 0000000..a19484e
--- /dev/null
+++ b/examples/apg4b-ex25.rs
@@ -0,0 +1,89 @@
+// https://atcoder.jp/contests/APG4b/tasks/APG4b_bx
+
+use fixedbitset::FixedBitSet;
+use itertools::Itertools as _;
+
+fn main() {
+    // use std::io::{self, Read as _};
+    //
+    // let mut input = "".to_owned();
+    // io::stdin().read_to_string(&mut input).unwrap();
+    // let mut input = input.split_whitespace();
+    // macro_rules! read {
+    //      ([$t:tt; $n:expr]) => {
+    //          (0..$n).map(|_| read!($t)).collect::<Vec<_>>()
+    //      };
+    //      (($($t:tt),+)) => {
+    //          ($(read!($t)),*)
+    //      };
+    //      (_1based) => {
+    //          read!(usize) - 1
+    //      };
+    //      (_bytes) => {
+    //          read!(String).into_bytes()
+    //      };
+    //      ($ty:ty) => {
+    //          input.next().unwrap().parse::<$ty>().unwrap()
+    //      };
+    //  }
+    //
+    // let n = read!(usize);
+    // let a = read!([usize; n]);
+    // let m = read!(usize);
+    // let b = read!([usize; m]);
+    // let arg0 = read!(String);
+    // let args = read!([usize; if arg0 == "subtract" { 1 } else { 0 }]);
+
+    use proconio::input;
+
+    input! {
+        n: usize,
+        a: [usize; n],
+        m: usize,
+        b: [usize; m],
+        arg0: String,
+        args: [usize; if arg0 == "subtract" { 1 } else { 0 }],
+    }
+
+    let (a, b) = (a.into_iter().collect(), b.into_iter().collect());
+
+    print_set(&match (&*arg0, &*args) {
+        ("intersection", []) => intersection(&a, &b),
+        ("union_set", []) => union_set(&a, &b),
+        ("symmetric_diff", []) => symmetric_diff(&a, &b),
+        ("subtract", &[x]) => subtract(a, x),
+        ("increment", []) => increment(&a),
+        ("decrement", []) => decrement(&a),
+        _ => unreachable!(),
+    });
+}
+
+fn print_set(set: &FixedBitSet) {
+    println!("{}", (0..50).filter(|&i| set[i]).format(" "));
+}
+
+fn intersection(a: &FixedBitSet, b: &FixedBitSet) -> FixedBitSet {
+    a & b
+}
+
+fn union_set(a: &FixedBitSet, b: &FixedBitSet) -> FixedBitSet {
+    a | b
+}
+
+fn symmetric_diff(a: &FixedBitSet, b: &FixedBitSet) -> FixedBitSet {
+    a ^ b
+}
+
+fn subtract(mut a: FixedBitSet, x: usize) -> FixedBitSet {
+    // > xは存在することが保証される。
+    a.set(x, false);
+    a
+}
+
+fn increment(a: &FixedBitSet) -> FixedBitSet {
+    a.ones().map(|x| (x + 1) % 50).collect()
+}
+
+fn decrement(a: &FixedBitSet) -> FixedBitSet {
+    a.ones().map(|x| (x + 49) % 50).collect()
+}
diff --git a/examples/apg4b-ex26.rs b/examples/apg4b-ex26.rs
new file mode 100644
index 0000000..ecc0c9a
--- /dev/null
+++ b/examples/apg4b-ex26.rs
@@ -0,0 +1,235 @@
+// https://atcoder.jp/contests/APG4b/tasks/APG4b_bw
+
+use itertools::Itertools as _;
+use maplit::hashmap;
+use matches::matches;
+
+use std::collections::HashMap;
+use std::io::{self, Read as _};
+use std::str::FromStr;
+
+fn main() {
+    let mut input = "".to_owned();
+    io::stdin().read_to_string(&mut input).unwrap();
+    let mut env = hashmap!();
+    for line in input.lines().skip(1) {
+        line.parse::<Stmt>().unwrap().eval(&mut env);
+    }
+}
+
+#[derive(Debug)]
+enum Stmt {
+    DeclInt(char, IntExpr),
+    PrintInt(IntExpr),
+    DeclVec(char, VecExpr),
+    PrintVec(VecExpr),
+}
+
+impl Stmt {
+    fn eval(&self, env: &mut HashMap<char, Val>) {
+        match self {
+            Self::DeclInt(name, expr) => {
+                env.insert(*name, Val::Int(expr.eval(env)));
+            }
+            Self::PrintInt(expr) => println!("{}", expr.eval(env)),
+            Self::DeclVec(name, expr) => {
+                env.insert(*name, Val::Vec(expr.eval(env)));
+            }
+            Self::PrintVec(expr) => println!("[ {} ]", expr.eval(env).iter().format(" ")),
+        }
+    }
+}
+
+impl FromStr for Stmt {
+    type Err = (String, usize, nom::error::ErrorKind);
+
+    fn from_str(input: &str) -> Result<Self, (String, usize, nom::error::ErrorKind)> {
+        use nom::branch::alt;
+        use nom::bytes::complete::{tag, take_while_m_n};
+        use nom::character::complete::{char, one_of, space0, space1};
+        use nom::combinator::{map, map_res};
+        use nom::multi::{fold_many0, separated_list};
+        use nom::sequence::{pair, preceded, tuple};
+        use nom::IResult;
+
+        fn decl_int(input: &str) -> IResult<&str, Stmt> {
+            let (input, _) = space0(input)?;
+            let (input, _) = tag("int")(input)?;
+            let (input, _) = space1(input)?;
+            let (input, name) = var_name(input)?;
+            let (input, _) = space0(input)?;
+            let (input, _) = tag("=")(input)?;
+            let (input, _) = space0(input)?;
+            let (input, expr) = int_expr(input)?;
+            let (input, _) = space0(input)?;
+            let (input, _) = char(';')(input)?;
+            Ok((input, Stmt::DeclInt(name, expr)))
+        }
+
+        fn print_int(input: &str) -> IResult<&str, Stmt> {
+            let (input, _) = space0(input)?;
+            let (input, _) = tag("print_int")(input)?;
+            let (input, _) = space1(input)?;
+            let (input, expr) = int_expr(input)?;
+            let (input, _) = space0(input)?;
+            let (input, _) = tag(";")(input)?;
+            Ok((input, Stmt::PrintInt(expr)))
+        }
+
+        fn decl_vec(input: &str) -> IResult<&str, Stmt> {
+            let (input, _) = space0(input)?;
+            let (input, _) = tag("vec")(input)?;
+            let (input, _) = space1(input)?;
+            let (input, name) = var_name(input)?;
+            let (input, _) = space0(input)?;
+            let (input, _) = char('=')(input)?;
+            let (input, _) = space0(input)?;
+            let (input, val) = vec_expr(input)?;
+            let (input, _) = space0(input)?;
+            let (input, _) = char(';')(input)?;
+            Ok((input, Stmt::DeclVec(name, val)))
+        }
+
+        fn print_vec(input: &str) -> IResult<&str, Stmt> {
+            let (input, _) = space0(input)?;
+            let (input, _) = tag("print_vec")(input)?;
+            let (input, _) = space1(input)?;
+            let (input, val) = vec_expr(input)?;
+            let (input, _) = space0(input)?;
+            let (input, _) = char(';')(input)?;
+            Ok((input, Stmt::PrintVec(val)))
+        }
+
+        fn int_expr(input: &str) -> IResult<&str, IntExpr> {
+            let (input, expr) = int_term(input)?;
+            fold_many0(
+                preceded(space0, pair(one_of("+-"), preceded(space0, int_term))),
+                expr,
+                |expr, (op, term)| match op {
+                    '+' => IntExpr::Add(Box::new(expr), Box::new(term)),
+                    '-' => IntExpr::Sub(Box::new(expr), Box::new(term)),
+                    _ => unreachable!(),
+                },
+            )(input)
+        }
+
+        fn int_term(input: &str) -> IResult<&str, IntExpr> {
+            let (input, _) = space0(input)?;
+            alt((
+                map(var_name, IntExpr::Var),
+                map(
+                    take_while_m_n::<_, &str, _>(1, 1, |c| matches!(c, '0'..='9')),
+                    |s| IntExpr::Lit(s.parse().unwrap()),
+                ),
+            ))(input)
+        }
+
+        fn vec_expr(input: &str) -> IResult<&str, VecExpr> {
+            let (input, expr) = vec_term(input)?;
+            fold_many0(
+                preceded(space0, pair(one_of("+-"), preceded(space0, vec_term))),
+                expr,
+                |expr, (op, term)| match op {
+                    '+' => VecExpr::Add(Box::new(expr), Box::new(term)),
+                    '-' => VecExpr::Sub(Box::new(expr), Box::new(term)),
+                    _ => unreachable!(),
+                },
+            )(input)
+        }
+
+        fn vec_term(input: &str) -> IResult<&str, VecExpr> {
+            let (input, _) = space0(input)?;
+            alt((map(var_name, VecExpr::Var), |input| {
+                let (input, _) = char('[')(input)?;
+                let (input, _) = space0(input)?;
+                let (input, vec) =
+                    separated_list(tuple((space0, char(','), space0)), int_expr)(input)?;
+                let (input, _) = space0(input)?;
+                let (input, _) = char(']')(input)?;
+                Ok((input, VecExpr::Lit(vec)))
+            }))(input)
+        }
+
+        fn var_name(input: &str) -> IResult<&str, char> {
+            map_res(take_while_m_n(1, 1, |c| matches!(c, 'a'..='z')), str::parse)(input)
+        }
+
+        decl_int(input)
+            .or_else(|_| print_int(input))
+            .or_else(|_| decl_vec(input))
+            .or_else(|_| print_vec(input))
+            .map(|(_, stmt)| stmt)
+            .map_err(|err| match err {
+                nom::Err::Incomplete(_) => unreachable!(),
+                nom::Err::Error((s, k)) | nom::Err::Failure((s, k)) => {
+                    (input.to_owned(), input.len() - s.len(), k)
+                }
+            })
+    }
+}
+
+#[derive(Debug)]
+enum Val {
+    Int(i32),
+    Vec(Vec<i32>),
+}
+
+impl Val {
+    fn unwrap_int(&self) -> i32 {
+        match self {
+            Self::Int(n) => *n,
+            Self::Vec(_) => panic!(),
+        }
+    }
+
+    fn unwrap_vec(&self) -> &[i32] {
+        match self {
+            Self::Int(_) => panic!(),
+            Self::Vec(vec) => vec,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+enum IntExpr {
+    Lit(i32),
+    Var(char),
+    Add(Box<Self>, Box<Self>),
+    Sub(Box<Self>, Box<Self>),
+}
+
+impl IntExpr {
+    fn eval(&self, env: &HashMap<char, Val>) -> i32 {
+        match self {
+            Self::Lit(n) => *n,
+            Self::Var(s) => env[s].unwrap_int(),
+            Self::Add(l, r) => l.eval(env) + r.eval(env),
+            Self::Sub(l, r) => l.eval(env) - r.eval(env),
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+enum VecExpr {
+    Lit(Vec<IntExpr>),
+    Var(char),
+    Add(Box<Self>, Box<Self>),
+    Sub(Box<Self>, Box<Self>),
+}
+
+impl VecExpr {
+    fn eval(&self, env: &HashMap<char, Val>) -> Vec<i32> {
+        match self {
+            Self::Lit(v) => v.iter().map(|x| x.eval(env)).collect(),
+            Self::Var(s) => env[s].unwrap_vec().to_owned(),
+            Self::Add(l, r) => {
+                let (l, r) = (l.eval(env), r.eval(env));
+                l.into_iter().zip_eq(r).map(|(l, r)| l + r).collect()
+            }
+            Self::Sub(l, r) => {
+                let (l, r) = (l.eval(env), r.eval(env));
+                l.into_iter().zip_eq(r).map(|(l, r)| l - r).collect()
+            }
+        }
+    }
+}
diff --git a/examples/tests.ron b/examples/tests.ron
index e86cc49..c96e7e5 100644
--- a/examples/tests.ron
+++ b/examples/tests.ron
@@ -7,6 +7,14 @@
             name: "APG4b: A - 1.00.はじめに",
             matching: ExactWhole,
         ),
+        "apg4b-ex25": (
+            name: "APG4b: EX25 - 集合の操作 / 3.05",
+            matching: ExactWords,
+        ),
+        "apg4b-ex26": (
+            name: "APG4b: EX26 - 電卓を作ろう3 / 3.06",
+            matching: ExactWords,
+        ),
         "practice-a": (
             name: "practice contest: A - Welcome to AtCoder",
             matching: ExactWords,
@@ -23,8 +31,20 @@
             name: "ABC049 / ARC065: C - 白昼夢 / Daydream",
             matching: ExactWords,
         ),
+        "abc054-c": (
+            name: "ABC045: C - One-stroke Path",
+            matching: ExactWords,
+        ),
+        "abc084-d": (
+            name: "ABC084: D - 2017-like Number",
+            matching: ExactWords,
+        ),
         "abc120-d": (
-            name: "ABC120: D - Decayed Bridges ",
+            name: "ABC120: D - Decayed Bridges",
+            matching: ExactWords,
+        ),
+        "abc142-d": (
+            name: "ABC124: D - Disjoint Set of Common Divisors",
             matching: ExactWords,
         ),
     }
diff --git a/examples/testsets/abc054-c/in/sample_01.txt b/examples/testsets/abc054-c/in/sample_01.txt
new file mode 100644
index 0000000..bc88773
--- /dev/null
+++ b/examples/testsets/abc054-c/in/sample_01.txt
@@ -0,0 +1,4 @@
+3 3
+1 2
+1 3
+2 3
diff --git a/examples/testsets/abc054-c/in/sample_02.txt b/examples/testsets/abc054-c/in/sample_02.txt
new file mode 100644
index 0000000..052f07a
--- /dev/null
+++ b/examples/testsets/abc054-c/in/sample_02.txt
@@ -0,0 +1,8 @@
+7 7
+1 3
+2 7
+3 4
+4 5
+4 6
+5 6
+6 7
diff --git a/examples/testsets/abc054-c/out/sample_01.txt b/examples/testsets/abc054-c/out/sample_01.txt
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ b/examples/testsets/abc054-c/out/sample_01.txt
@@ -0,0 +1 @@
+2
diff --git a/examples/testsets/abc054-c/out/sample_02.txt b/examples/testsets/abc054-c/out/sample_02.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/examples/testsets/abc054-c/out/sample_02.txt
@@ -0,0 +1 @@
+1
diff --git a/examples/testsets/abc084-d/in/sample_01.txt b/examples/testsets/abc084-d/in/sample_01.txt
new file mode 100644
index 0000000..6990404
--- /dev/null
+++ b/examples/testsets/abc084-d/in/sample_01.txt
@@ -0,0 +1,2 @@
+1
+3 7
diff --git a/examples/testsets/abc084-d/in/sample_02.txt b/examples/testsets/abc084-d/in/sample_02.txt
new file mode 100644
index 0000000..988378b
--- /dev/null
+++ b/examples/testsets/abc084-d/in/sample_02.txt
@@ -0,0 +1,5 @@
+4
+13 13
+7 11
+7 11
+2017 2017
diff --git a/examples/testsets/abc084-d/in/sample_03.txt b/examples/testsets/abc084-d/in/sample_03.txt
new file mode 100644
index 0000000..da66f27
--- /dev/null
+++ b/examples/testsets/abc084-d/in/sample_03.txt
@@ -0,0 +1,7 @@
+6
+1 53
+13 91
+37 55
+19 51
+73 91
+13 49
diff --git a/examples/testsets/abc084-d/out/sample_01.txt b/examples/testsets/abc084-d/out/sample_01.txt
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ b/examples/testsets/abc084-d/out/sample_01.txt
@@ -0,0 +1 @@
+2
diff --git a/examples/testsets/abc084-d/out/sample_02.txt b/examples/testsets/abc084-d/out/sample_02.txt
new file mode 100644
index 0000000..680eb50
--- /dev/null
+++ b/examples/testsets/abc084-d/out/sample_02.txt
@@ -0,0 +1,4 @@
+1
+0
+0
+1
diff --git a/examples/testsets/abc084-d/out/sample_03.txt b/examples/testsets/abc084-d/out/sample_03.txt
new file mode 100644
index 0000000..10cd9ca
--- /dev/null
+++ b/examples/testsets/abc084-d/out/sample_03.txt
@@ -0,0 +1,6 @@
+4
+4
+1
+1
+1
+2
diff --git a/examples/testsets/abc142-d/in/sample_01.txt b/examples/testsets/abc142-d/in/sample_01.txt
new file mode 100644
index 0000000..f86db24
--- /dev/null
+++ b/examples/testsets/abc142-d/in/sample_01.txt
@@ -0,0 +1 @@
+12 18
diff --git a/examples/testsets/abc142-d/in/sample_02.txt b/examples/testsets/abc142-d/in/sample_02.txt
new file mode 100644
index 0000000..2b55e52
--- /dev/null
+++ b/examples/testsets/abc142-d/in/sample_02.txt
@@ -0,0 +1 @@
+420 660
diff --git a/examples/testsets/abc142-d/in/sample_03.txt b/examples/testsets/abc142-d/in/sample_03.txt
new file mode 100644
index 0000000..381ada1
--- /dev/null
+++ b/examples/testsets/abc142-d/in/sample_03.txt
@@ -0,0 +1 @@
+1 2019
diff --git a/examples/testsets/abc142-d/out/sample_01.txt b/examples/testsets/abc142-d/out/sample_01.txt
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ b/examples/testsets/abc142-d/out/sample_01.txt
@@ -0,0 +1 @@
+3
diff --git a/examples/testsets/abc142-d/out/sample_02.txt b/examples/testsets/abc142-d/out/sample_02.txt
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ b/examples/testsets/abc142-d/out/sample_02.txt
@@ -0,0 +1 @@
+4
diff --git a/examples/testsets/abc142-d/out/sample_03.txt b/examples/testsets/abc142-d/out/sample_03.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/examples/testsets/abc142-d/out/sample_03.txt
@@ -0,0 +1 @@
+1
diff --git a/examples/testsets/apg4b-ex25/in/sample_01.txt b/examples/testsets/apg4b-ex25/in/sample_01.txt
new file mode 100644
index 0000000..72d1a5d
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/in/sample_01.txt
@@ -0,0 +1,5 @@
+3
+0 1 2
+3
+1 2 3
+intersection
diff --git a/examples/testsets/apg4b-ex25/in/sample_02.txt b/examples/testsets/apg4b-ex25/in/sample_02.txt
new file mode 100644
index 0000000..975f08a
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/in/sample_02.txt
@@ -0,0 +1,5 @@
+3
+0 1 2
+3
+1 2 3
+union_set
diff --git a/examples/testsets/apg4b-ex25/in/sample_03.txt b/examples/testsets/apg4b-ex25/in/sample_03.txt
new file mode 100644
index 0000000..cc0e508
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/in/sample_03.txt
@@ -0,0 +1,5 @@
+3
+0 1 2
+3
+1 2 3
+symmetric_diff
diff --git a/examples/testsets/apg4b-ex25/in/sample_04.txt b/examples/testsets/apg4b-ex25/in/sample_04.txt
new file mode 100644
index 0000000..c5ee91b
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/in/sample_04.txt
@@ -0,0 +1,5 @@
+3
+0 1 2
+3
+1 2 3
+subtract 2
diff --git a/examples/testsets/apg4b-ex25/in/sample_05.txt b/examples/testsets/apg4b-ex25/in/sample_05.txt
new file mode 100644
index 0000000..354e615
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/in/sample_05.txt
@@ -0,0 +1,5 @@
+3
+0 1 49
+3
+1 2 3
+increment
diff --git a/examples/testsets/apg4b-ex25/in/sample_06.txt b/examples/testsets/apg4b-ex25/in/sample_06.txt
new file mode 100644
index 0000000..8d4d22c
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/in/sample_06.txt
@@ -0,0 +1,5 @@
+3
+0 1 49
+3
+1 2 3
+decrement
diff --git a/examples/testsets/apg4b-ex25/out/sample_01.txt b/examples/testsets/apg4b-ex25/out/sample_01.txt
new file mode 100644
index 0000000..8d04f96
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/out/sample_01.txt
@@ -0,0 +1 @@
+1 2
diff --git a/examples/testsets/apg4b-ex25/out/sample_02.txt b/examples/testsets/apg4b-ex25/out/sample_02.txt
new file mode 100644
index 0000000..fd15fe1
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/out/sample_02.txt
@@ -0,0 +1 @@
+0 1 2 3
diff --git a/examples/testsets/apg4b-ex25/out/sample_03.txt b/examples/testsets/apg4b-ex25/out/sample_03.txt
new file mode 100644
index 0000000..65c9b94
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/out/sample_03.txt
@@ -0,0 +1 @@
+0 3
diff --git a/examples/testsets/apg4b-ex25/out/sample_04.txt b/examples/testsets/apg4b-ex25/out/sample_04.txt
new file mode 100644
index 0000000..6e8183b
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/out/sample_04.txt
@@ -0,0 +1 @@
+0 1
diff --git a/examples/testsets/apg4b-ex25/out/sample_05.txt b/examples/testsets/apg4b-ex25/out/sample_05.txt
new file mode 100644
index 0000000..63fb4bf
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/out/sample_05.txt
@@ -0,0 +1 @@
+0 1 2
diff --git a/examples/testsets/apg4b-ex25/out/sample_06.txt b/examples/testsets/apg4b-ex25/out/sample_06.txt
new file mode 100644
index 0000000..03ebe79
--- /dev/null
+++ b/examples/testsets/apg4b-ex25/out/sample_06.txt
@@ -0,0 +1 @@
+0 48 49
diff --git a/examples/testsets/apg4b-ex26/in/sample_01.txt b/examples/testsets/apg4b-ex26/in/sample_01.txt
new file mode 100644
index 0000000..c73dcea
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_01.txt
@@ -0,0 +1,5 @@
+4
+int x = 1 + 2 ;
+print_int x + 3 ;
+vec a = [ 1 , 2 , x ] ;
+print_vec a + [ 4 , 5 , 6 ] ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_02.txt b/examples/testsets/apg4b-ex26/in/sample_02.txt
new file mode 100644
index 0000000..52f5052
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_02.txt
@@ -0,0 +1,3 @@
+2
+print_int 1 - 2 ;
+print_vec [ 1 , 2 , 3 ] - [ 3 , 2 , 1 ] ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_03.txt b/examples/testsets/apg4b-ex26/in/sample_03.txt
new file mode 100644
index 0000000..9698270
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_03.txt
@@ -0,0 +1,2 @@
+1
+print_int 5 ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_04.txt b/examples/testsets/apg4b-ex26/in/sample_04.txt
new file mode 100644
index 0000000..58ee2d6
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_04.txt
@@ -0,0 +1,2 @@
+1
+print_vec [ 1 , 2 ] ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_05.txt b/examples/testsets/apg4b-ex26/in/sample_05.txt
new file mode 100644
index 0000000..0f3f7a4
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_05.txt
@@ -0,0 +1,3 @@
+2
+int x = 1 ;
+print_int x ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_06.txt b/examples/testsets/apg4b-ex26/in/sample_06.txt
new file mode 100644
index 0000000..bca6173
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_06.txt
@@ -0,0 +1,3 @@
+2
+vec a = [ 3 , 4 ] ;
+print_vec a ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_07.txt b/examples/testsets/apg4b-ex26/in/sample_07.txt
new file mode 100644
index 0000000..edbcbb1
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_07.txt
@@ -0,0 +1,5 @@
+4
+int x = 1 ;
+int y = 2 ;
+int z = 3 ;
+print_int x + y + z ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_08.txt b/examples/testsets/apg4b-ex26/in/sample_08.txt
new file mode 100644
index 0000000..62b13df
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_08.txt
@@ -0,0 +1,5 @@
+4
+vec a = [ 1 , 2 , 3 ] ;
+vec b = [ 4 , 5 , 6 ] ;
+vec c = [ 7 , 8 , 9 ] ;
+print_vec a + b + c ;
diff --git a/examples/testsets/apg4b-ex26/in/sample_09.txt b/examples/testsets/apg4b-ex26/in/sample_09.txt
new file mode 100644
index 0000000..ba24ea5
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/in/sample_09.txt
@@ -0,0 +1,7 @@
+6
+vec a = [ 1 , 2 ] ;
+vec b = a + [ 3 , 4 ] ;
+vec c = a - [ 5 , 6 ] ;
+print_vec a ;
+print_vec b ;
+print_vec c ;
diff --git a/examples/testsets/apg4b-ex26/out/sample_01.txt b/examples/testsets/apg4b-ex26/out/sample_01.txt
new file mode 100644
index 0000000..e21af7e
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_01.txt
@@ -0,0 +1,2 @@
+6
+[ 5 7 9 ]
diff --git a/examples/testsets/apg4b-ex26/out/sample_02.txt b/examples/testsets/apg4b-ex26/out/sample_02.txt
new file mode 100644
index 0000000..22e4cf0
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_02.txt
@@ -0,0 +1,2 @@
+-1
+[ -2 0 2 ]
diff --git a/examples/testsets/apg4b-ex26/out/sample_03.txt b/examples/testsets/apg4b-ex26/out/sample_03.txt
new file mode 100644
index 0000000..7ed6ff8
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_03.txt
@@ -0,0 +1 @@
+5
diff --git a/examples/testsets/apg4b-ex26/out/sample_04.txt b/examples/testsets/apg4b-ex26/out/sample_04.txt
new file mode 100644
index 0000000..b4a1e66
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_04.txt
@@ -0,0 +1 @@
+[ 1 2 ]
diff --git a/examples/testsets/apg4b-ex26/out/sample_05.txt b/examples/testsets/apg4b-ex26/out/sample_05.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_05.txt
@@ -0,0 +1 @@
+1
diff --git a/examples/testsets/apg4b-ex26/out/sample_06.txt b/examples/testsets/apg4b-ex26/out/sample_06.txt
new file mode 100644
index 0000000..b6f6fec
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_06.txt
@@ -0,0 +1 @@
+[ 3 4 ]
diff --git a/examples/testsets/apg4b-ex26/out/sample_07.txt b/examples/testsets/apg4b-ex26/out/sample_07.txt
new file mode 100644
index 0000000..1e8b314
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_07.txt
@@ -0,0 +1 @@
+6
diff --git a/examples/testsets/apg4b-ex26/out/sample_08.txt b/examples/testsets/apg4b-ex26/out/sample_08.txt
new file mode 100644
index 0000000..b77f265
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_08.txt
@@ -0,0 +1 @@
+[ 12 15 18 ]
diff --git a/examples/testsets/apg4b-ex26/out/sample_09.txt b/examples/testsets/apg4b-ex26/out/sample_09.txt
new file mode 100644
index 0000000..20db499
--- /dev/null
+++ b/examples/testsets/apg4b-ex26/out/sample_09.txt
@@ -0,0 +1,3 @@
+[ 1 2 ]
+[ 4 6 ]
+[ -4 -4 ]

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