Graph:

	...
	.#.

Von Neumann adjacency as an adjacency matrix:

	0 1 0 1 0 0
	1 0 1 0 0 0
	0 1 0 0 0 1
	1 0 0 0 0 0
	0 0 0 0 0 0
	0 0 1 0 0 0

Moore adjacency:

	0 1 0 1 0 0
	1 0 1 1 0 1
	0 1 0 0 0 1
	1 1 0 0 0 0
	0 0 0 0 0 0
	0 1 1 0 0 0

Rook adjacency:

	0 1 1 1 0 0
	1 0 1 0 0 0
	1 1 0 0 0 1
	1 0 0 0 0 0
	0 0 0 0 0 0
	0 0 1 0 0 0