tile edges matches {{N E S W}*}
num tile types=6
num binding types=4
tile edges={
{1 0 0 1}
{1 0 1 3}
{3 1 0 2}
{4 2 0 1}
{3 3 3 3}
{4 3 4 3}}
binding strengths=
{2 2 1 1}