.2..5.64.31...........8.......62....8......7.........1...3.7.....9...2.....1.....
*-----------------------------------------------------------------------------*
| 7 2 8 | 9 5 1 | 6 4 3 |
| 3 1 45 | 24 7 6 |a589 a2589 a2589 |
| 4569 4569 456 | 24 8 3 | 157 a125 a257 |
*-------------------------+-------------------------+-------------------------|
| 1459 34579 13457 | 6 2 489 | 34589 3589 4589 |
| 8 3469 2346 | 5 1 49 | 349 7 26 |
| 24569 4569 2456 | 7 3 489 | 4589 26 1 |
*-------------------------+-------------------------+-------------------------|
| 12456 4568 12456 | 3 469 7 | 14589 15689 45689 |
|b146 3467 9 | 8 b46 5 | 2 36-1 b467 |
| 456 345678 34567 | 1 469 2 | 345789 35689 456789 |
*-----------------------------------------------------------------------------*
[(1=7)b3p45689-(7=1)r8c159]-1r8c8; ste
*-----------------------------------------------------------------------------*
| 7 2 8 | 9 5 1 | 6 4 3 |
| 3 1 45 | 24 7 6 | 589 2589 2589 |
| 4569 4569 456 | 24 8 3 | 157 125 257 |
*-------------------------+-------------------------+-------------------------|
|b1459 34579 c13457 | 6 2 489 | 34589 3589 4589 |
| 8 3469 2346 | 5 1 49 | 349 7 26 |
| 24569 4569 2456 | 7 3 489 | 4589 26 1 |
*-------------------------+-------------------------+-------------------------|
| 12456 4568 12456 | 3 469 7 | 14589 15689 45689 |
|a146 346-7 9 | 8 a46 5 | 2 136 a467 |
| 456 345678 c34567 | 1 469 2 | 34589-7 35689 45689-7 |
*-----------------------------------------------------------------------------*