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Proof step 1 from proof e-04 (conclusion)

⊦ x = z0 + y + z ∧ # x = # y → z0 = [] ∧ z = []

System applied rule normalize

And obtained the following new goals

Proof step 2:
# x = # y, x = z0 + y + z ⊦ z0 = [] ∧ z = []

Rule argument

Additional information