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Proof step 3 from proof difference (previous step)

⊦ count(a, bag0 \ bag1) = (count(a, bag1) < count(a, bag0) ⊃ count(a, bag0) - count(a, bag1);0), count(a, bag0 \ bag1) = (count(a, bag1) ≤ count(a, bag0) ⊃ count(a, bag0) - count(a, bag1);0)

User applied rule weakening

And obtained the following new goals

Rule argument

poslist: right 2

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