Acronym	bril (old: driss)
Name	birectified heptapeton
Circumradius	sqrt(6/7) = 0.925820
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Incidence matrix according to Dynkin symbol

o3o3x3o3o3o

. . . . . . | 35 ♦  12 |  12  18 |  4  18  12 |  6 12  3 | 4 3
------------+----+-----+---------+------------+----------+----
. . x . . . |  2 | 210 |   2   3 |  1   6   3 |  3  6  1 | 3 2
------------+----+-----+---------+------------+----------+----
. o3x . . . |  3 |   3 | 140   * |  1   3   0 |  3  3  0 | 3 1
. . x3o . . |  3 |   3 |   * 210 |  0   2   2 |  1  4  1 | 2 2
------------+----+-----+---------+------------+----------+----
o3o3x . . . ♦  4 |   6 |   4   0 | 35   *   * |  3  0  0 | 3 0
. o3x3o . . ♦  6 |  12 |   4   4 |  * 105   * |  1  2  0 | 2 1
. . x3o3o . ♦  4 |   6 |   0   4 |  *   * 105 |  0  2  1 | 1 2
------------+----+-----+---------+------------+----------+----
o3o3x3o . . ♦ 10 |  30 |  20  10 |  5   5   0 | 21  *  * | 2 0
. o3x3o3o . ♦ 10 |  30 |  10  20 |  0   5   5 |  * 42  * | 1 1
. . x3o3o3o ♦  5 |  10 |   0  10 |  0   0   5 |  *  * 21 | 0 2
------------+----+-----+---------+------------+----------+----
o3o3x3o3o . ♦ 20 |  90 |  60  60 | 15  30  15 |  6  6  0 | 7 *
. o3x3o3o3o ♦ 15 |  60 |  20  60 |  0  15  30 |  0  6  6 | * 7