Author: Andrey Bogdanov
Split the grid into orthogonally connected areas, such that each area contains exactly two clue cells, and such that the size of each area lies strictly between the values of the two clues that it contains.
Grid control: To draw a cut click at the cell edge or move mouse along the line holding the button. You can also connect the cells which belong to the same area with auxiliary line. More details about grid control are at the help page.