Border Block

Border Block (Bodaburokku) is a Japanese logic puzzle. Divide the diagram into regions, ensuring that identical cells are grouped in the same region.

Rules: The grid must be divided into regions by entering numbers in the empty white cells.
Cells with the same number belong to the same region (the number has nothing to do with the size of the region).
Without exception, all grid points that are adjacent to two or more regions are marked with a dot.