Describe how regions just outside of a part relate to other parts. This is done a box at a time.alphabetic index hierarchy of classesThe indexes ilower and iupper map directly to the indexes nbor_ilower and nbor_iupper. Although, it is required that indexes increase from ilower to iupper, indexes may increase and/or decrease from nbor_ilower to nbor_iupper.
The index_map describes the mapping of indexes 0, 1, and 2 on part part to the corresponding indexes on part nbor_part. For example, triple (1, 2, 0) means that indexes 0, 1, and 2 on part part map to indexes 1, 2, and 0 on part nbor_part, respectively.
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