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Proof step 4 from proof app (previous step)

str2 + str0 = str2 + str1, ∀ str0, str1. str2 + str0 = str2 + str1 → str0 = str1 ⊦ str0 = str1

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: str0, str1

Additional information

Used terms: str0, str1