Question: prove valid 1 . ( Ew ) ~ ( ~Aw & ~Bw ) / ( Eu ) ( ( ~Au & ~Tu ) ( ~Tu

prove valid
1.(Ew) ~( ~Aw & ~Bw)/(Eu)((~Au & ~Tu)(~Tu Cu))
2.(y)(~(By Cy) ~(Ay ~By))
3.(v)((~Av Bv)(Av ~Bv))

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