x : Nat
⊢ foo x = 10
x : Nat
⊢ foo x = 10
x : Nat
⊢ foo x = 10
x : Nat
⊢ foo x = 10
x : Nat
⊢ foo x - 3 = 7
x : Nat
⊢ foo x = 10
x : Nat
⊢ boo x
x : Nat
⊢ boo x
x : Nat
⊢ boo x
x : Nat
⊢ boo x