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Second level tubulating tetraflexagon


  
Figure 17: The 12 vertices of the generic second level tetraflexagon can be connected to produce tubulations.
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Figure 18: Permutation of the squares along the strip for a tubulating second level tetraflexagon.
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Figure 19: Top side of the tubulating second level tetraflexagon. Two strips are shown, sufficient to make both of the two sectors which the flexagon requires.
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Figure 20: Bottom side of the tubulating second level tetraflexagon. Two strips are shown, sufficient to make both of the two sectors which the flexagon requires.
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2000-09-05