mat( ( 1,0,1,0,0,1,0,0,1,0,0,0,0,0,0),
     ( 1,0,0,0,3,0,0,0,0,0,1,0,0,0,0),
     ( 0,0,1,0,0,0,0,0,0,1,0,0,0,0,0),
     ( 0,1,0,0,0,0,0,0,0,1,0,0,0,0,0),
     ( 0,0,0,1,0,0,0,1,0,0,1,0,0,0,0),
     ( 0,0,0,0,0,1,0,0,0,0,0,1,0,0,0),
     ( 0,0,0,0,0,0,0,0,0,0,0,1,0,0,0),
     ( 0,0,0,0,0,0,0,0,0,0,0,0,1,0,0),
     ( 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0 ) )