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

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

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

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

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