That's just a warm-up. Now try
9...3..7..6.4..8..........1.8....6......97....1.......7.3....9....8.....2........
- Code: Select all
+---+---+---+
|9..|.3.|.7.|
|.6.|4..|8..|
|...|...|..1|
+---+---+---+
|.8.|...|6..|
|...|.97|...|
|.1.|...|...|
+---+---+---+
|7.3|...|.9.|
|...|8..|...|
|2..|...|...|
+---+---+---+