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Proof step 12 from proof validrefs-delcycle-01 (previous step)

validrefs(str, [] + r ' + refs0 + r ' + refs1, ty, st) ⊦ validrefs(str, [] + r ' + refs1, ty, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
validrefs(str, r ' + refs0 + r ' + refs1, ty, st) ⊦ validrefs(str, r ' + refs1, ty, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1], [CSIMPSEQ : ⊦ [] + refs = refs])]]