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

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

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

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

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