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

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

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

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

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