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Proof step 3 from proof len-app (previous step)

∀ str0. #(str1 + str0) = # str1 + # str0 ⊦ #(str1 + str0) = # str1 + # str0

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: str0

Additional information

Used terms: str0