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U1^2 = 2/3U3
U2-U1=U3-U2 -> 2*U2=U3+U1
-> U1+ U2+U3=0
-> 3*U2= 0 -> U2=0
U2=0 -> U1+U3=0 -> U1= - U3
U1^2=2/3U3 -> (- U3)^2 = 2/3U3
-> U3=2/3
U3-U2 = U4-U3 -> 2/3 - 0 = U4- 2/3
-> U4 = 4/3