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Orbits (1149)
Instruction:
Place a number from 0 to X-1 into each cell so that each number appears exactly once in each row and column. (X is the number of cells in each row.) Some ellipses are drawn on the grid; for each ellipse, exactly one cell is entirely inside the ellipse. The number in that cell must equal the sum of all the numbers the ellipse passes through. Some numbers may already be filled in for you.