Question: I need help with this problem please, and please make it legible sometimes I can't read it. 4. Let U be any set. Prove that

I need help with this problem please, and please make it legible sometimes I can't read it.

I need help with this problem please, and please make it legible

4. Let U be any set. Prove that for every B e g;)(U) there is a unique D e 3:;(U) such that for every C e 33(U), C \\ B = C n D

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