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Proof step 2 from proof less-append (previous step)

str0 = "", str < str + str0 ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
str < str ⊦

Rule argument

Additional information

Used simplifier rules: a: ⊦ (str + str0) + str1 = str + str0 + str1; from specification list[string]% ⊦ str + "" = str; (s)