Set of Pairs (k,m) for A in R nxn

• k & m are even

• 0 ? k < m ? n -2

• n(n-2)/8 pairs

• a pair defines 2 triples

• n(n-2)/4 triples

• pivot pair: 2x1 block

• Sweep: when all pivot pairs are considered

(2,4,5)

(3,4,5)

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