This hypercompact hyperbolic tesselation uses the hetrat in the sense of an infinite bollohedron as one of its cells.

Incidence matrix according to Dynkin symbol

o3x3o7o   (N,M → ∞)

. . . . | 6NM ♦   14 |    7   14 |   7  2
--------+-----+------+-----------+-------
. x . . |   2 | 42NM |    1    2 |   2  1
--------+-----+------+-----------+-------
o3x . . |   3 |    3 | 14NM    * |   2  0
. x3o . |   3 |    3 |    * 28NM |   1  1
--------+-----+------+-----------+-------
o3x3o . ♦   6 |   12 |    4    4 | 7NM  *
. x3o7o ♦  6M |  21M |    0  14M |   * 2N