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Axiom TR polyhedron.svg LaTeX source documentclass amsart usepackage amsmath amssymb nopageno usepackageall xy begin document begin equation xymatrix em Y' ar dr arddl Z' ar ur ard X' arll circ hole hole arddl hole hole arrr circ ardru aru aruul arurv aruul hole hole end equation end document talk File Octahedral