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

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

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

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

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