>, included in the project, is a
good example. It has icon states 0, 17, 68, 85, and 255, which make it useful
for <a href="#47">47-state autojoining</a>. State 0 is all outer edges: It's
for tiles that won't join to any other. State 17 is for joining to the north
and south; notice it has edges to either side. State 68 is the same east and
west. 85's edges are inside corners, which is what you get when joining in
all 4 cardinal directions but not diagonally. And finally, 255 is for tiles
completely surround