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Proof step 6 from proof short-equal (previous step)

s2i(shoi) = s2i(shoj), i2s(s2i(shoj)) = shoj, i2s(s2i(shoi)) = shoi ⊦ shoi = shoj

User applied rule insert equation

And closed the goal!

Rule argument

pos: left 1 flags: discard

Additional information