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x = n(A) - 4-2-10 = 20-16 = 4
w = n(B intersection C) - 2 = 7-2 = 5
y = n(B)-4-2-w = 20-6-w = 14-w = 14-5 = 9
z = n(C) - 10-2-w = 27-12-w = 15-w = 15-5 = 10
t = n(S) - n(A) - n(B) - n(C) +4+2+10+w +2 = 51-20-20-27+18+5 = 7
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