.0      .1      .2      .3      .4      .5      .6      .7      .8      .9
     0       0       0       0       0       0       0       0       0       0       0
     1       0       0       0       0       0       0       0       0       0       0
     2       0       0       0       0       0       0       0       0       0       0
     3       0       0       0       0       0       0       0       0       0       0
     4       0       0       0       0       0       0       0       0       0       0
     5       0       0       0       0       0       0       0       0       0       0
     6       0       0       0       0       0       0       0       1       1       1
     7       1       1       1       1       1       1       1       1       1       1
     8       1       1       1       1       1       1       1       1       1       1
     9       1       1       1       1       1       1       1       1       1       2
    10       2       2       2       2       2       2       2       2       2       2
    11       2       2       2       2       2       2       2       2       2       3
    12       3       3       3       3       3       3       3       3       3       3
    13       3       3       4       4       4       4       4       4       4       4
    14       4       5       5       5       5       5       5       6       6       6
    15       6       6       7       7       7       7       7       8       8       8
    16       9       9       9      10      10      10      11      11      11      12
    17      12      13      13      14      14      15      15      16      16      17
    18      17      18      18      19      19      20      21      21      22