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Proof step 4 from proof inj-03 (previous step)

str = char + str1, char = str0.char1, str1 = str0.rstring ⊦ str0 = "", str = "", str = str0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ str0 = "", str0.char1 + str0.rstring = str0

Rule argument

Additional information

Used simplifier rules: empty: ⊦ char + str ≠ "";