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

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

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

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

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