tile edges matches {{N E S W}*}
num tile types=7
num binding types=5
tile edges={
{1 0 0 1}
{1 0 1 4}
{4 1 0 2}
{4 2 0 3}
{5 3 0 1}
{4 4 4 4}
{5 4 5 4}}
binding strengths=
{2 2 2 1 1}