Find the distance between the vector u=(1,1,1,1)u = (1, 1, 1, 1)u=(1,1,1,1) and the subspace WWW defined by x1+x2+x3+x4=0x_1 + x_2 + x_3 + x_4 = 0x1+x2+x3+x4=0.
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444