TTR (Topological Types Relations) 

TTR collection is based on the TTO collection and lists all ways of transformation from one net to another that are realized in crystal structures. If for a given crystal structure there are at least two possible representations in the TTO collection, and these representations have different topology, a pair of the corresponding nets appears in the TTR collection. In other words, these nets can be transformed to each other if the structure groups are chosen in different ways in the initial crystal structure.

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Topological Types Relations
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For example a diamond (dia) net can be transformed to a srs net by an appropriate choice of dimers (edges) in dia and matching them to srs vertices.

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