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

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

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

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

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