Normal sudoku rules apply. Cells separated by a white dot must have consecutive digits; on a black dot, one digit is double the other. ALL POSSIBLE DOTS ARE GIVEN (a 1:2 combination may have either colour of dot). Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 cluster of cells is entirely shaded or unshaded. Orthogonally adjacent cells which separate shaded and unshaded regions must contain digits that differ by at least 3. Heavy black lines denote separation between shaded and unshaded regions. Cells separated by an X must have digits that sum to 10. For each X, both cells are either in the shaded or unshaded region. Not all X's are shown.
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