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Math Path (1183)
Instruction:
Place a number from 1 to X into each cell so that every cell has a different number. (X is the total number of cells.) If two numbers differ by one, they must be in cells that touch at a corner or an edge. A number in the upper-left corner of each region (if given) indicates the value of one of the four basic operations 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 operation may or may not be given in the region, but at least one of the four operations must apply. Some numbers may be given in the grid.
Black areas are not part of the grid (do not put any numbers in them).
If a region has only one cell, a given number is equal to the number that should be placed in the cell.