Firumatto #55
The grid must be divided into rectangles along the grid lines. A rectangle must be exactly 1 cell wide and 1-4 cells long.
If a rectangle contains a number cell, the number indicates the length of the rectangle. A rectangle may contain no more than one number cell.
Rectangles of the same size must not be orthogonally adjacent. A maximum of three rectangles may meet at a single grid point.