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Proof step 8 from proof less-append (previous step)

∀ str0. str0 = "" ∨ str1 < str1 + str0 ⊦ str0 = "", str1 < 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