Set: pp::colors
  Set: pp::unicode
tuple 10, 20 : ℕ ⨯ ℕ
tuple 10, 20, 30 : ℕ ⨯ ℕ ⨯ ℕ
tuple 10, ⊤, (λ x : ℕ, x > 10) : ℕ ⨯ Bool ⨯ (ℕ → Bool)