Table  problem(r,c)  Partly filled in cells
    c1   c2   c3   c4   c5   c6   c7   c8   c9
r1             1         6         3    9
r2   5                             8
r3        8         4                   1     
r4                            5    7    2
r5   7                                       
r6        1    2    7
r7        9                   4         3
r8             6                             2
r9        3    4         8    6              
 ;