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derive the conclusions of each of the following arguments using the rules of inference for F.
-1. (∀x)[Ax ⊃ (∃y)(By • Cxy)]
2. (∃x)(Ax • Dx)
3. (∀x)(Bx ⊃ Ex) / (∃x)[Dx • (∃y)(Ey • Cxy)]
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