L. ?-r-(x, x ? i ) ? R (x,x') for all i ? [n], 2. if (a, b), (c, d) ? R (x,x') , then (a ? c, b ? d) ? R (x,x') , 3. if (a, b)

, From this observation we immediately have the following auxiliary lemma

L. 3. Let-x,-x'-?-l-n-and-y,-y-?-?-l, The following assertions are equivalent. References

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, Time required (in milliseconds), for varying n, k, and m (g = 200, vol.3, p.0