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

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

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

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

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