From Daan
Hoezee
Simple swap
Two solutions are related by a 'simple swap' if all tiles are identical, apart from two tiles forming a rectangle, appearing in reverse order.
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Compound swap
Solutions are related by a 'compound swap' if all tiles are identical, apart from two forming a rectangle, which in terms forms a rectangle with a third tile.
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Imperfect compound swap
Solutions are related by an 'imperfect compound swap' if all tiles are identical, apart from a number of two forming a rectangle, appearing in reverse order.
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Hook swap
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Partial retiling
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