First level tubulating tetraflexagon cutout

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**Figure 6:** Top side of the first level tubulating tetraflexagon cutout, characterized by the sign sequence (+ + - -). The cutout is small enough that both top and bottom for two sectors are shown, enough to make two separate flexagons.
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**Figure 7:** reverse side of the first level tubulating tetraflexagon cutout.
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Microcomputadoras
2000-11-01