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

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

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

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

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