....6.3...72.......4..........2...48.......7.....1....1....56..3..4..1.....7.....
SER unknown.
+--------------+---------+------------+
| 589 159 159 | 58 6 7 | 3 2 4 |
|a56 7 2 | 3 4 9 | 8 1 56 |
|a568 4 3 | 1 b58 2 | 7 59 569 |
+--------------+---------+------------+
|a59 16 16 | 2 7 3 | 59 4 8 |
| 4 3 5-9 | 6 c59 8 | 2 7 1 |
| 7 2 8 | 59 1 4 | 59 6 3 |
+--------------+---------+------------+
| 1 89 4 | 89 2 5 | 6 3 7 |
| 3 589 7 | 4 89 6 | 1 589 2 |
| 2 5689 569 | 7 3 1 | 4 589 59 |
+--------------+---------+------------+
+---------------------+-----------------+-------------------+
| 589 159 159 | 58 6 7 | 3 2 4 |
| d56* 7 2 | 3 4 9 | 8 1 c56* |
| 568* 4 3 | 1 a58 2 | 7 b59 569* |
+---------------------+-----------------+-------------------+
| e59 16 16 | 2 7 3 | 59 4 8 |
| 4 3 f59 | 6 9-5 8 | 2 7 1 |
| 7 2 8 | 59 1 4 | 59 6 3 |
+---------------------+-----------------+-------------------+
| 1 89 4 | 89 2 5 | 6 3 7 |
| 3 589 7 | 4 89 6 | 1 589 2 |
| 2 5689 569 | 7 3 1 | 4 589 59 |
+---------------------+-----------------+-------------------+
*----------------------------------------*
| 589 159 19-5 | 58 6 7 | 3 2 4 |
|b56 7 2 | 3 4 9 | 8 1 56 |
|a568 4 3 | 1 c58 2 | 7 59 569 |
|----------------+----------+------------|
| 9-5 16 16 | 2 7 3 | 59 4 8 |
| 4 3 e59 | 6 d59 8 | 2 7 1 |
| 7 2 8 | 59 1 4 | 59 6 3 |
|----------------+----------+------------|
| 1 89 4 | 89 2 5 | 6 3 7 |
| 3 589 7 | 4 89 6 | 1 589 2 |
| 2 5689 569 | 7 3 1 | 4 589 59 |
*----------------------------------------*
,-----------------------------------------------------------,
|*589 #159 #159 | 8-5 6 7 | 3 2 4 |
|*56 7 2 | 3 4 9 | 8 1 56 |
|*568 4 3 | 1 *58 2 | 7 59 569 |
|-------------------+-------------------+-------------------|
|*59 16 16 | 2 7 3 |*59 4 8 |
| 4 3 59 | 6 59 8 | 2 7 1 |
| 7 2 8 |*59 1 4 |*59 6 3 |
|-------------------+-------------------+-------------------|
| 1 89 4 | 89 2 5 | 6 3 7 |
| 3 589 7 | 4 89 6 | 1 589 2 |
| 2 5689 569 | 7 3 1 | 4 589 59 |
'-----------------------------------------------------------'
+------------------+-----------+--------------+
|(589) 1[5]9 1[-5]9| 8*5 6 7 | 3 2 4 |
|[5]6 7 2 | 3 4 9 | 8 1 56 |
|[5]68 4 3 | 1 58 2 | 7 59 569 |
+------------------+-----------+--------------+
| 9-5 16 16 | 2 7 3 | 59 4 8 |
| 4 3 9*5 | 6 9*5 8 | 2 7 1 |
| 7 2 8 | 9*5 1 4 | 59 6 3 |
+------------------+-----------+--------------+
| 1 89 4 | 89 2 5 | 6 3 7 |
| 3 589 7 | 4 89 6 | 1 589 2 |
| 2 5689 569 | 7 3 1 | 4 589 59 |
+------------------+-----------+--------------+
589 159 159 58 6 7 3 2 4
56 7 2 3 4 9 8 1 56
568 4 3 1 58 2 7 59 569
59 16 16 2 7 3 59 4 8
4 3 59 6 59 8 2 7 1
7 2 8 59 1 4 59 6 3
1 89 4 89 2 5 6 3 7
3 589 7 4 89 6 1 589 2
2 5689 569 7 3 1 4 589 59
5r1c4 => r189c2 <> 5
r1c4=5 - c5n5{r3 r5} - c3n5{r5 r9}
=> r1c4 <> 5
ste.
+--------------=--+-----------+--------------+
|(589) 1[5]9 1[5]9| 8-5 6 7 | 3 2 4 |
|[5]6 7 2 | 3 4 9 | 8 1 56 |
|[5]68 4 3 | 1 58 2 | 7 59 569 |
+-----------------+-----------+--------------+
|[5]9 16 16 | 2 7 3 | 59 4 8 |
|(4) 3 [5]9 |(6) [5]9 8 | 2 7 1 |
| 7 2 8 |[5]9 1 4 | 59 6 3 |
+-----------------+-----------+--------------+
| 1 89 4 | 89 2 5 | 6 3 7 |
| 3 589 7 | 4 89 6 | 1 589 2 |
| 2 5689 569 | 7 3 1 | 4 589 59 |
+-----------------+-----------+--------------+
+-----------------+-------------+--------------+
|(589) 1[5]9 1[5]9|[5]8 (6) 7 | 3 2 4 |
|[5]6 7 2 | 3 4 9 | 8 1 56 |
|[5]68 4 3 | 1 [5]8 2 | 7 59 569 |
+-----------------+-------------+--------------+
|(59) 16 16 | 2 7 3 | 59 4 8 |
| 4 3 5-9 | 6 (59) 8 | 2 7 1 |
| 7 2 8 | 59 1 4 | 59 6 3 |
+-----------------+-------------+--------------+
| 1 89 4 | 89 2 5 | 6 3 7 |
| 3 589 7 | 4 89 6 | 1 589 2 |
| 2 5689 569 | 7 3 1 | 4 589 59 |
+-----------------+-------------+--------------+