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Proof step 4 from proof bag-swap-del (previous step)

⊦ count(a0, bag -- a -- b) = count(a0, bag -- b -- a)

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 5:
a0 = b ⊦ count(a0, bag -- a -- b) = count(a0, bag -- b -- a)
Proof step 7:
⊦ a0 = b, count(a0, bag -- a -- b) = count(a0, bag -- b -- a)

Rule argument

fma: a0 = b

Additional information

Used formulas: a0 = b