-- import Adam.Metadata
-- import Mathlib

-- Game "Adam"
-- World "TestWorld"
-- Level 1

-- Title "Annahmen"

-- Introduction "yadaa yadaa"

-- class MyClass (n : ℕ) where

-- Statement name
-- "Beweise dieses Lemma."
-- (n m : ℕ) : CommSemigroup ℕ where
--   mul := fun i j => 0
--   mul_comm := sorry
--   mul_assoc := sorry

-- --@[exercise]
-- instance instTest (n m : ℕ) : CommSemigroup ℕ where
--   mul := fun i j => 0
--   mul_comm := by
--     sorry
--   mul_assoc := by
--     sorry

-- --@[exercise]
-- lemma asdf (a b c d : ℕ) (h₁ : c = d) (h₂ : a = b) (h₃ : a = d) : b = c := by
--   rewrite [h₁]
--   rw [←h₂]
--   assumption


-- Conclusion ""

-- NewTactic assumption