finding subpattern in 4 directions
res = ( findmatch ( mat , pat , x - 1 , y , nrow , ncol , level + 1 ) | findmatch ( mat , pat , x + 1 , y , nrow , ncol , level + 1 ) | findmatch ( mat , pat , x , y - 1 , nrow , ncol , level + 1 ) | findmatch ( mat , pat , x , y + 1 , nrow , ncol , level + 1 ) ) NEW_LINE