(0 20 2)(1 5 3)(4 17 11 9 6)(7 19 16 10 8)(12 15 13)(14 21 18)
ALLOWS (11/8)-SEQUENCE
1: (1 5 7)

(0 20 2)(1 19 16 10 8 7 3)(4 17 11 9 6)(5)(12 15 13)(14 21 18)
2: (4 17 6)

(0 20 2)(1 19 16 10 8 7 3)(4)(5)(6 11 9)(12 15 13)(14 21 18)(17)
3: (1 19 8)

(0 20 2)(1 7 3)(4)(5)(6 11 9)(8 16 10)(12 15 13)(14 21 18)(17)(19)
4: (14 21 18)

(0 20 2)(1 7 3)(4)(5)(6 11 9)(8 16 10)(12 15 13)(14)(17)(18)(19)(21)