mat( ( 0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0),
     ( 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,0),
     ( 0,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0),
     ( 0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0 ) )