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and higher. A truncation removes vertices, and inserts a new facet in place of each former vertex. Faces are truncated, doubling their edges. (The term, coined by Kepler, comes from Latin truncare 'to cut off'.)
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#* There are higher truncations also: bitruncation t_1,2 or 2t, tritruncation t_2,3 or 3t, quadritruncation t_3,4 or 4t, quintitruncation t_4,5 or

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