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

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

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

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

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