* week 1
[[1, 2, 4], [3, 5, 13], [6, 8, 19], [7, 16, 20], [9, 11, 14], [10, 15, 18], [12, 17, 21]]
* week 2
[[1, 3, 10], [2, 11, 18], [4, 13, 16], [5, 14, 19], [6, 9, 12], [7, 15, 17], [8, 20, 21]]
* week 3
[[1, 6, 14], [2, 7, 9], [3, 15, 21], [4, 10, 11], [5, 12, 20], [8, 13, 18], [16, 17, 19]]
* week 4
[[1, 7, 11], [2, 5, 17], [3, 6, 16], [4, 9, 18], [8, 12, 15], [10, 19, 20], [13, 14, 21]]
* week 5
[[1, 9, 20], [2, 12, 13], [3, 7, 8], [4, 6, 15], [5, 16, 18], [10, 14, 17], [11, 19, 21]]
* week 6
[[1, 12, 19], [2, 16, 21], [3, 9, 17], [4, 7, 14], [5, 8, 10], [6, 18, 20], [11, 13, 15]]
* week 7
[[1, 13, 17], [2, 6, 10], [3, 11, 12], [4, 5, 21], [7, 18, 19], [8, 9, 16], [14, 15, 20]]
* week 8
[[1, 15, 16], [2, 3, 20], [4, 8, 17], [5, 6, 11], [7, 10, 21], [9, 13, 19], [12, 14, 18]]
* week 9
[[1, 18, 21], [2, 8, 14], [3, 4, 19], [5, 9, 15], [6, 7, 13], [10, 12, 16], [11, 17, 20]]