tile edges matches {{N E S W}*}
num tile types=7
num binding types=3
tile edges={
{1 0 0 1}[.2]
{1 0 1 3}[.1]
{2 1 0 1}[.05]
{3 3 2 2}
{2 2 2 2}
{2 3 3 3}
{3 2 3 2}}
binding strengths=
{3 1 1}