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Figure 7
On the left side the black triangles form an opposite pair of triangles. So too do the pairs of smaller triangles labeled [A,A^{{\prime}}] and [B,B^{{\prime}}]. On the right-hand side the two black triangles do not form an opposite pair, but the two purple triangles [C,C^{{\prime}}] do.

ISSN: 2053-2733
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