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Proof step 22 from proof unchanged-levelsubset-equiv (previous step)

level⊆(str, str0) ⊦ unchanged(str, r, st, st0) ↔ unchanged(str0, r, st, st0), junkref(str, r, st)

User applied rule case distinction

And obtained the following new goals

Rule argument

[CASEDARG : pos: right 1, ()]

Additional information

[[CONCRETESIMPRULES : ()]]