***** b2,1 *****

4 cosets
3 double cosets
Sizes:
0: ()
      [1]	1
1: (1)
      [2]	q + q^2
2: (121)
      [1]	q^3

Neighbours of a point in 0:
1:  [2]		q + q^2

Neighbours of a point in 1:
0:  [1]		1
1:  [0]		-1 + q
2:  [1]		q^2

Neighbours of a point in 2:
1:  [2]		1 + q
2:  [0]		-1 + q^2