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

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

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

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

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