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## sudoku
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### Instructions
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- Create a program that resolves a sudoku.
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- A valid sudoku has only one possible solution.
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Make sure you submit all the necessary files to run the program.
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### Usage
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#### Example 1:
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Example of output for a valid sudoku :
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```console
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$ go run . ".96.4...1" "1...6...4" "5.481.39." "..795..43" ".3..8...." "4.5.23.18" ".1.63..59" ".59.7.83." "..359...7" | cat -e
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3 9 6 2 4 5 7 8 1$
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1 7 8 3 6 9 5 2 4$
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5 2 4 8 1 7 3 9 6$
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2 8 7 9 5 1 6 4 3$
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9 3 1 4 8 6 2 7 5$
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4 6 5 7 2 3 9 1 8$
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7 1 2 6 3 8 4 5 9$
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6 5 9 1 7 4 8 3 2$
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8 4 3 5 9 2 1 6 7$
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$
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```
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#### Example 2:
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Examples of expected outputs for invalid inputs or sudokus :
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```console
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$ go run . 1 2 3 4 | cat -e
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Error$
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$ go run . | cat -e
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Error$
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$ go run . ".96.4...1" "1...6.1.4" "5.481.39." "..795..43" ".3..8...." "4.5.23.18" ".1.63..59" ".59.7.83." "..359...7" | cat -e
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Error$
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$
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```
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