Dominion was created by Inaba Naoki
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid; some cells have letters in them.
The goal is to black pairs of squares to create regions.
The solved grid must satisfy the following conditions:
Every region has at least one letter in it.
Two different regions cannot have the same letter.
Two different letters cannot be in the same region.
Black squares for two-square dominos that cannot touch other dominos except diagonally.