質和數獨 Prime Sums Sudoku (全標)
規則：在空格中填入1∼9，使得每一行、列、宮中的數字都沒有重複外；標示處的上下或左右相鄰兩數之和需為質數；未標示處不能有此關係。
rule：Apply classic sudoku rules. A dot means that the sum of the digits in the two neighbouring cells is a prime number. All possible dots are given.
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