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Proof step 24 from proof newrefs-two (previous step)

newref(st) = newref(st[newref(st) -- 0 ', noval]) ⊦

User applied rule flip equation

And obtained the following new goals

Proof step 23:
newref(st[newref(st) -- 0 ', noval]) = newref(st) ⊦

Rule argument

[fmapos-arg: pos: left 1]

Additional information

[[CONCRETESIMPRULES : ()]]