| a,b,c,d,e,f | |
| 1,2,3,4,5,6 | |
| 2,3,4,5,6,7 | |
| 3,4,5,6,7,8 | |
| 4,5,6,7,8,9 | |
| 5,6,7,8,9,10 | |
| 6,7,8,9,10,11 | |
| 7,8,9,10,11,12 | |
| 8,9,10,11,12,13 | |
| 9,10,11,12,13,14 | |
| 10,11,12,13,14,15 | |
| 11,12,13,14,15,16 | |
| 12,13,14,15,16,17 | |
| 13,14,15,16,17,18 | |
| 14,15,16,17,18,19 | |
| 15,16,17,18,19,20 | |
| 16,17,18,19,20,21 | |