X4

yi y2

yi y,2 = yi + y2+y3 y,3 = y2 + y3+y4 y,4 = y3+y4 + ys

y"3 = y'2+y'3 + y'4 y'4 = y'3+y'4+y's y'3 = y1 + 2 y2 + 3 y3 + 2 y4 + y5 -

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