2                4                5

1 1 1 3 4 5

1                                                                                                                                               2 2 3 4 5

2                                                                                                                                               3 3

                          5                6

4 3 1 6 6 7

1                                                                                                                                               4 2

6 6 7

2                                                                                                                                               5 3

                          7                8

4                                                                                                                                               1 4 7 8 8

5                                                                                                                                               2 5 7 8 8

6                                                                                                                                               3 6

                          8                9

7 3 6 9 9 9

1                                                                                                                                               4 7 9 9 9

2                                                                                                                                               5 8