## Labels (e.g. colours and/or forms) assigned to the points might also be included, such that coinciding points also must have equal labels. This can be implemented in two ways:

- Storing the labels in the table
- The table can be hashed by using the labels in addition to the coordinates

## It is straightforward to extend the hashing technique to include several models, such that a query is simultaneously compared to several models. The only extension in the hash table is that a model identification must be stored along with the basis pairs

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