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

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

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

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

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