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The generic second level tetraflexagon has twelve faces, and is still quite easy to fold up from a previously prepared strip of paper.
Figure 13:
Since each edge of the first level tetraflexagon spawns two new vertices, the full second level tetraflexagon has 12 vertices.
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Figure 14:
Permutation of the squares along the strip for a normal second level tetraflexagon. They run in order, subject to packages being flipped over.
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Figure 15:
Strips from which the second level tetraflexagon can be folded. One strip folds into a single sector, so two are needed altogether.
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Figure 16:
Back side of the two strips for the second level normal tetraflexagon. One sector per strip.
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Example user SuSE Linux 6.2
2000-09-05