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| i2xy | Convert (x,y)-coordinates to single-number indices and back. |
| tilingdrosophila20rdmentrezgcdf | tilingdrosophila20rdmentrezgcdf |
| tilingdrosophila20rdmentrezgdim | tilingdrosophila20rdmentrezgdim |
| xy2i | Convert (x,y)-coordinates to single-number indices and back. |