Norinori

Norinori is a Japanese logic puzzle. Blacken some cells of the grid, where the black cells must form dominoes consisting of two adjacent black cells.

Rules: Colour the grey cells of the grid dark or white. There are exactly two cells to darken in each region.
Each pair of dark cells must form a 2×1 or 1×2 domino, regardless of the region’s borders. Two dominoes must not touch each other orthogonally (but diagonally).