Where,

A only = A - ( ab + x + ca ),

B only = B - ( bc + x + ab ),

C only = C - ( bc + x + ca ),

AB = (AnB) - x,

BC = (BnC) - x,

CA = (Cna) - x,

x = AnBnC,

D = U - (A only + B only + C only + AB + BC + CA + x)

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