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Battleships (Index Sums) (1026)
Instruction:
Locate the indicated fleet of ships in the grid. Ships may be rotated before being placed in the grid. Each piece of a ship occupies a single cell. A cell that does not contain a ship piece is considered "sea". Ships do not touch each other, not even diagonally (that is, if two ship pieces are cells that share an edge or a corner, they must be part of the same ship). The contents of some cells are given for you.
Each cell in the grid has a row number (the white-on-gray numbers to the right of the grid) and a column number (the white-on-gray numbers below the grid). Each large number above the grid represents the sums of the row numbers of the ship pieces in that column. Each large number to the left of the grid represents the sums of the column numbers of the ship pieces in that row.