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Suppose that when the probability of e changes from $equation$ the positions of result tuple x and y are inverted (in $equation$ x is ranked before y; in $equation$ x is ranked after y). If we use x0 and xj to denote the position of x in R0 and $equation$ respectively, and y0 and yj the position of y in R0 and $equation$ respectively, then

$equation$

Hence, all the distances $equation$

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