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TomTom (Operations) (364)
Instruction:
Place a number from 1 to X into each cell so that each number appears exactly once in each row and column. (X is the number of cells in each row.) Numbers may repeat within a region. The number in the upper-left corner of each outlined region indicates the value of the given operation applied to all numbers in the region, starting with the largest number for subtraction and division (e.g., 1, 2, 4 with division has a clue of 2÷ as 4÷2÷1=2). The number may or may not be given in the region; but its value must be a whole number (that is, not negative or fractional — a value of 0 is permitted).