English: Four-sided regular polygon tile with two paths linking the four sides. The filename uniquely describes the shape of the paths as follows, using the nomenclature "Square (yz) AB-CD:
yz describes the adjacency of the linked sides, where:
y is the number of paths with adjacency 1 (i.e., paths that link sides separated by one side. For the square shown here, this means opposite sides).
z is the number of paths with adjacency 0 (adjacent sides)
AB-CD describes the two paths linking two sides each. The sides are numbered sequentially from 1 to 4, starting with the bottom edge and proceeding anti-clockwise, so side 2 is the right edge, side 3 is the top edge, and side 4 is the left edge. AB means sides A and B are linked by a path, and CD means sides C and D are linked by a path.
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