 1 a pr2X pr2X (;r2X row ! $;r2X 2X yr2X |r2X 2X Xr2X q p[n2X ( ) 2X |r2X 2X xr2X 2X q p[n2X 2X r2X 2X q p[n2X |r2X X|r2X r2X q p[n2X 2X }r2X {r2X 2X 2X r2X q p[n2X 0&;r2X 2X H~r2X }r2X 2X r2X q X p[n2X Q $;r2X 2X r2X q X p[n2X 2X ! P 9 ̢r2X r X %n2X 2X ( |r2X 8r2X 2X ( r X n2X P r2X r2X 2X ( 2X 0r2X 2X r pn2X ( Q 2X ( 2X 0r2X 2X r n2X ! ( tch_row X H&r2X |