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U1 = -1-4
= -5
U2 = -2-4
= -6
U3 = -3-4
= -7
U1 + U2 + U3 = -5 + (-6) + (-7)
= - 18
U2 = -2-4 =-6
U3 = -3-4 = -7
U1 + U2 + U3 = -5 +(-6)+(-7) = -5-6-7 = -18