Properties of the Spine

NS8: ( nf ??j???sl AND Vj > Hi-1, Hi > Vj-1 )

• NS8 ??PN ? PS , WE8 ??PW ??PE are sets having at least one cell in each row, respective column of R

WE8: ( wf ??i ? el AND

Vj > Hi-1, Hi > Vj-1 )

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