pdl> p $x

[
 [0 0 0 0 0 0]
 [1 0 0 0 0 0]
 [1 0 0 0 1 0]
 [1 0 1 1 1 0]
 [1 0 0 1 0 0]
 [1 0 0 0 0 1]
 [0 0 0 0 1 1]
]