Rules: Shade in some cells so that all shaded cells are connected orthogonally in a single group and no 2×2 square is completely shaded. There can be no islands -enclosed areas of one or more unshaded cells - all unshaded cells should be accessible to the grid borders through other unshaded cells. Black circle indicates that cells on either side of the edge are both shaded and each of the two shaded cells has at least one shaded neighbor not counting the cell across the circle. White circles add no such constraint, but, exactly one of the two cells on its sides need be shaded. A grey circle is either black or white, and the colour needs to be determined.
About: "Spheres of Influence" was invented by Anurag Sahay.
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