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Proof step 5 from proof right-trim-trim (previous step)

str0.last ∈ str ∧ str0 ≠ "", ∀ str1, str. # str1 < # str0 → true → string-right-trim(str, string-right-trim(str, str1)) = string-right-trim(str, str1) ⊦ string-right-trim(str, string-right-trim(str, str0.butlast)) = string-right-trim(str, str0.butlast)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
str0.last ∈ str, ∀ str1, str. # str1 < # str0 → true → string-right-trim(str, string-right-trim(str, str1)) = string-right-trim(str, str1) ⊦ str0 = "", string-right-trim(str, string-right-trim(str, str0.butlast)) = string-right-trim(str, str0.butlast)

Proof step 5 from proof right-trim-trim (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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