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Proof step 28 from proof contains-trans-01 (conclusion)

⊦ contains(str, ty ' + tys + ty0 ') ∧ contains(str, ty0 ' + tys0 + ty1 ') → contains(str, ty ' + tys + ty0 ' + tys0 + ty1 ')

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 27:
contains(str, ty0 ' + tys0 + ty1 '), contains(str, ty ' + tys + ty0 ') ⊦ contains(str, ty ' + tys + ty0 ' + tys0 + ty1 ')

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]