           0           2           1          -1          -2
          -1           0           1           1          -1
          18  1
           0           0           1           1          -1      0
           0           0           0           0           0      0
           0           0           1           0           0      0
          -1           1           1           1          -1      0
          -1           1           1           0          -1      0
          -1           1           2           0          -1      0
           0           1           1          -1          -1      0
           0           1           1           0          -1      0
           0           1           1           0          -2      0
           0           2           1           0          -2      0
          -1           2           2           0          -2      0
          -1           2           1           0          -2      0
           0           0           1           0          -1      0
          -1           0           1           0          -1      0
           0           1           1           0           0      0
          -1           1           1           0          -2      0
           0           2           1           0          -1      0
           0           2           2           0          -2      0
 ctable
           0           0           0           0          18           2           0           0          13           0
           1           4           3          10          11           0           0           0          14           0
           0          15           0          18           0           0           0           2           0          13
           0           0          15           0           0           0           2           0           5           0
           8           0           6           4           0           0          14           0           0          16
           0           0           0          15           0           0           0           5           0           7
           0          11           0           8           6           0           0          16           0           0
           0          17           0           0          15           5          13           0           7           9
           0          10           0           0           8          16           0           0           0           0
           0           0          18           0          17          12           9           0           2           0
          18           0           0          17           0           0           7          12           0           2
          10           0          11           0           0           0          16           0           0           0
           0           8           0           1           3          14           0           0           0           0
          13           5           0           2           0           0           0           0           0           0
           0           0           0           0           0           0           3           4           6           8
           9          12           7           0           5           0           0           0           0           0
           0           0           0           0           0           0           8           0          11          10
           0           0           0           0           0          11           0          10           3           1
