Point 0:  8,  9, 15, 16
Point 13:  1,  2
Point 15: 22, 23
Point 19:  7, 14
Cell 0
  Field 0
21  22  23  24
14  15  16  17
 7   8   9  10
 0   1   2   3




Cell 1
  Field 0
24  25  26  27
17  18  19  20
10  11  12  13
 3   4   5   6




Cell 2
  Field 0
42  43  44  45
35  36  37  38
28  29  30  31
21  22  23  24




Cell 3
  Field 0
45  46  47  48
38  39  40  41
31  32  33  34
24  25  26  27