3倍宮數獨 Divisible by Three Sudoku

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；每一宮的行列和均需為 3 的倍數。
rule：Apply classic sudoku rules. Inside each 3x3 box all sums created by three horizontally or vertically adjacent digits must be divisible by 3.
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解答：
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