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U2 = 2.2 - 3 = 1
U3 = 2.3-3 = 3
U4 = 2.4 - 3 = 5
U5 = 2.5 -3 =7
u2 = 2.2 -3 = 1
u3 = 2.3 -3 = 3
u4 = 5
u5 = 7