| Lattice unit packs four worm wheels in such a way that each worm wheel propels the other three; the lattice unit is square-based with smaller faces. |
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Lattice unit packs three worm wheels in such a way that each worm wheel propels the other two; the lattice unit is square-based with larger faces. |
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| Octahedral unit packs twelve vortex tubes as worm wheels in six quadruplets and eight triplets that propel each other in a vortex lattice. |
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