### Rabbits and Trees

**Rabbits and Trees** (also known as *"Raitonanba"*, *"Light Number"*) is a square grid with numbers in some cells. The task is to place exactly one white circle ("rabbit") and one black circle ("tree") in every row and every column. A number indicates how many white circles ("rabbits") can be seen in the corresponding row and column. A rabbit is visible only when it is not hidden behind a tree.

**Cross+A** can solve puzzles from **5 x 5** to **20 x 20**.