To solve this riddle, let's first rearrange it in the following logic form
1. zop => Zap does zip
2. * does zip=> zop
3. zup does zip

We are starting with line 3 as our only truth statement.
we see that line 2 says that if anything does zip, then zop is true, because our truth statement in line 3 mentions zup doing zip, we can say that zop is true.
the first line says that if zop is true, then zap does zip.

Therefor, Zap do zip.
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