1 |6 2|8 3
   |3 4|  1
395|718|426
---+---+---
 7 |483|
 5 |976|3
   |125|78
---+---+---
541|869|237
6  |2 7|
   |5 1|

   .111.   |666.   .222|888.   .333
4  .111.4  |666. 5 .222|888. 5 .333
7  .111.7  |666.  9.222|888.7 9.333
...........|...........|...........
 2 . 2 . 2 |333.   .444|   .   .111
   .  6.  6|333. 5 .444| 5 . 5 .111
78 . 8 .78 |333.  9.444|  9.7 9.111
...........|...........|...........
333.999.555|777.111.888|444.222.666
333.999.555|777.111.888|444.222.666
333.999.555|777.111.888|444.222.666
-----------+-----------+-----------
12 .777. 2 |444.888.333|1  .1  . 2
   .777.   |444.888.333| 56. 56. 5
  9.777.  9|444.888.333|  9.  9.  9
...........|...........|...........
12 .555. 2 |999.777.666|333.1  . 2
4  .555.4  |999.777.666|333.4  .4
 8 .555. 8 |999.777.666|333.   .
...........|...........|...........
   .  3.  3|111.222.555|777.888.
4  .  6.4 6|111.222.555|777.888.4
  9.   .  9|111.222.555|777.888.  9
-----------+-----------+-----------
555.444.111|888.666.999|222.333.777
555.444.111|888.666.999|222.333.777
555.444.111|888.666.999|222.333.777
...........|...........|...........
666.  3.  3|222.  3.777|1  .1  .
666.   .   |222.4  .777| 5 .45 .45
666. 8 . 89|222.   .777|  9.  9. 89
...........|...........|...........
 2 . 23. 23|555.  3.111|   .   .
   .   .   |555.4  .111|  6.4 6.4
789. 8 .789|555.   .111|  9.  9. 89