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Proof step 10 from proof validrefs-delcycle-01 (previous step)

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

User applied rule insert equation

And obtained the following new goals

Proof step 9:
validrefs(str, (r ' + refs0) + r ' + refs1, ty, st) ⊦ validrefs(str, r ' + refs1, ty, st)

Rule argument

[inserteqarg: pos: left 1,F,T,()]

Additional information

[[CONCRETESIMPRULES : ()]]