0                1            //*                        2      3                     4      5        6          7       8         9      10

0       1           2                3         3             4             5            6       7     8             9       9                11        11

1         2               3              4          5        6         7          8                          9                10

1                 2        3                4           5                6             7             8          9            10

1               2              3                          4                 5             6           7             8                  9               10             11

1       2                                   3               4               5                6                 7                                  8                  9              10                11       12            13            14               15           16           17             18