p BB 111… xmB. xkBu.xkn Bnl B2.Bn2…x1B12…x1mB k1/12 kmAn H×(k+1) P n 11/1m 1m/m…xk1/1m…xMm/m nx(k+l)( 1) ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1 2 1 3 0 2 0 1 0 ( 1) 1 11 1 1 1 1 12 2 11 12 1 2 1 12 2 11 1 11 11 1 1 1 11 1  +                      • • • • • • • • • • • = • • • • • • −  + n k p p p p p p p x x x x x x x x x x x x Y n k n k k k n k m nm m m nm k m km nm n m n k km n n m n k km n                    