mmmlib: A cube may be dissected into three sections, one of which is a smoke ring of six irregular tetrahedra.///  Four tetrahedra may form a non-rigid ring, but it will not twirl completely. A smoke ring of three tetrahedra is rigid.

mmmlib: A cube may be dissected into three sections, one of which is a smoke ring of six irregular tetrahedra.///  Four tetrahedra may form a non-rigid ring, but it will not twirl completely. A smoke ring of three tetrahedra is rigid.

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