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Proof step 6 from proof union (previous step)

∀ a, bag1. count(a, bag ∪ bag1) = count(a, bag) + count(a, bag1) ⊦ count(a0, bag ∪ bag1) = count(a0, bag) + count(a0, bag1)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: a0, bag1

Additional information

Used terms: a0, bag1