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It either can be thought of as a degenerate 4D segmentotope with zero height, or as a 3D euclidean decomposition of the larger base into smaller bits.

Incidence matrix according to Dynkin symbol

reduced( xx5/2ox5oo&#x by 2doe )   → height = 0
(sissid || doe)

12  * |  5  5  0 |  5  5  5  0 | 1  5  1 0
 * 20 |  0  3  3 |  0  3  6  3 | 0  3  3 1
------+----------+-------------+----------
 2  0 | 30  *  * |  2  1  0  0 | 1  2  0 0
 1  1 |  * 60  * |  0  1  2  0 | 0  2  1 0
 0  2 |  *  * 30 |  0  1  2  2 | 0  2  2 1
------+----------+-------------+----------
 5  0 |  5  0  0 | 12  *  *  * | 1  1  0 0  {5/2}
 2  2 |  1  2  1 |  * 30  *  * | 0  2  0 0
 1  2 |  0  2  1 |  *  * 60  * | 0  1  1 0
 0  5 |  0  0  5 |  *  *  * 12 | 0  0  1 1  {5}
------+----------+-------------+----------
12  0 | 30  0  0 | 12  0  0  0 | 1  *  * *  sissid
 5 10 |  5 10  5 |  1  5  5  0 | * 12  * *  stiscu
 1  5 |  0  5  5 |  0  0  5  1 | *  * 12 *  peppy
 0 20 |  0  0 30 |  0  0  0 12 | *  *  * 1  doe