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Update 37. Sudoku Solver.md

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37. Sudoku Solver.md

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`‎37. Sudoku Solver.md‎`

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Original file line number	Diff line number	Diff line change
`@@ -38,6 +38,9 @@ class Solution {`
`38`	`38`	`for y in 0..<9 {`
`39`	`39`	`for x in 0..<9 {`
`40`	`40`	`let c = board[y][x]`
	`41`	`+ guard c != "." else {`
	`42`	`+ continue`
	`43`	`+ }`
`41`	`44`	`clo[y].insert(c)`
`42`	`45`	`row[x].insert(c)`
`43`	`46`	`block[x/3 + (y/3) * 3].insert(c)`

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