2. Every region of the grid must contain consecutive numbers starting at 1, up through the number of cells in that region. (For instance, a 4-cell region must contain the numbers 1 through 4.)
3. Any two occurrences of the same number in one row or column must have at least that number of other cells between them. (For instance, two 2's in the same row or column must have at least two other cells between them.)
