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Proof step 4 from proof rm-rm (previous step)

dups(rmdup(x)) ⊦ rmdup(rmdup(x)) = rmdup(x)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: <toplevel> name: rm-nodups seq: ⊦ ¬ dups(rmdup(x)) subst: [x] → [x] flags: <all paths>

Additional information

Used terms: x