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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 and . On the right-hand side the two black triangles do not form an opposite pair, but the two purple triangles do. |


journal menu![[Figure 7]](ae5032fig7.jpg)
and
. On the right-hand side the two black triangles do not form an opposite pair, but the two purple triangles
do.
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