Incidence matrix according to symbol extension

o3x:s3s5s = rect( x3o:s3s5s )   (N → ∞)

30N |   2   4   4 |   3   2   2   6   2 |   4 1 2
----+-------------+---------------------+--------
  2 | 30N   *   * |   1   0   2   0   0 |   2 0 1  underneath tips of former lacing trigs of 3pyrs
  2 |   * 60N   * |   1   0   0   2   0 |   2 0 1  underneath base-vertex of former lacing trigs of 3pyrs
  2 |   *   * 60N |   0   1   0   1   1 |   1 1 1  underneath vertices of other trigs
----+-------------+---------------------+--------
  3 |   1   2   0 | 30N   *   *   *   * |   2 0 0  rect of former lacing trigs of 3pyrs
  3 |   0   0   3 |   * 20N   *   *   * |   1 1 0  rect of former other trigs
  3 |   3   0   0 |   *   * 20N   *   * |   1 0 1  underneath tip of former 3-pyr
  3 |   0   2   1 |   *   *   * 60N   * |   1 0 1  underneath base-vertex of former 3-pyr
  5 |   0   0   5 |   *   *   *   * 12N |   0 1 1  underneath vertex of former ike
----+-------------+---------------------+--------
  6 |   3   6   3 |   3   1   1   3   0 | 20N * *  oct
 30 |   0   0  60 |   0  20   0   0  12 |   * N *  id
 60 |  30  60  60 |   0   0  20  60  12 |   * * N  snid