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+Range
+<p>
+Colour some squares black, so as to meet the following conditions:
+<ul>
+<li>
+No two black squares are orthogonally adjacent.
+<li>
+No group of white squares is separated from the rest of the grid by
+black squares.
+<li>
+Each numbered cell can see precisely that many white squares in
+total by looking in all four orthogonal directions, counting itself.
+(Black squares block the view. So, for example, a 2 clue must be
+adjacent to three black squares or grid edges, and in the fourth
+direction there must be one white square and then a black one beyond
+it.)
+</ul>
+
+<p>
+Left-click to colour a square black. Right-click to mark a square
+with a dot, if you know it should not be black.