Survo puzzles: www.survo.fi/puzzles
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Copyright (c) Survo Systems 2006-2007

Survo puzzle 75/2007 (60)

   A   B   C   D   E   F
1  *   *   *   *  16  17   54
2  *   *   *   *  15   *   70
3  8   7  12  14   *   *   78
4 11   9  13   *   *   *   98
  22  24  39  61  73  81

Survo puzzle 76/2007 (680)

   A   B   C   D   E   F
1  *   *   *  11   *   *   54
2  *   *   8   *   *  21   70
3  *   9   *   *  24   *   78
4 16   *   *  23   *  22   98
  22  24  39  61  73  81

Survo puzzle 77/2007 (?)

   A   B   C   D   E   F
1  *   *   *   *   *   *   54
2  *   *   *   *   *   *   70
3  *   *   *   *   *   *   78
4  *   *   *   *   *   *   98
  22  24  39  61  73  81

This problem has several solutions since the marginal sums are
exactly the same as those in two previous problems (75 and 76/2007).
The task is to find all solutions of this Survo puzzle.
It is required to give just the number of different solutions.
The task is practically impossible without making a computer
program made for solving Survo puzzles.

A prize of 100 euros is drawn at random for one of the people sending
the right answer on 13th October 2007 at the latest.