pdl> p rvals(19,19,{Centre=>[5,4]}) <= 6 [ [0 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0] [1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0] [1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0] [1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0] [1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0] [1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0] [1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0] [1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0] [0 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0] [0 0 1 1 1 1 1 1 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 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 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 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 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 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] ]