Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions.Everywhere 2 odd and 2 even digits form a 2x2 checkerboard pattern, a Battenburg marking is given.
A checkerboard pattern is a 2x2 area of cells where the top-left and bottom-right cells are of one type and the top-right and bottom-left cells are of another type.
All possible dots are marked.
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