1-1-4-4
Rotate alternate rows 270 degrees clockwise.
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1-1-3-3
Rotate alternate rows 180 degrees.
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1-1-2-2
Rotate alternate rows 90 degrees clockwise.
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1-1-1-1
This is the first pattern in the Library. All other patterns derive from this one. This is the only single-shape tessellation in the Library. One shape — the bird — fits against itself to fill the plane perfectly.
