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Merge pull requestneetcode-gh#1222 from sxsmg/1980-Find-Unique-Binary-String

Create 1980-Find-Unique-Binary-String.py

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	`1`	`+classSolution:`
	`2`	`+deffindDifferentBinaryString(self,nums:List[str])->str:`
	`3`	`+`
	`4`	`+strSet= {sforsinnums }`
	`5`	`+`
	`6`	`+defbacktrack(i,cur):`
	`7`	`+ifi==len(nums):`
	`8`	`+res="".join(cur)`
	`9`	`+returnNoneifresinstrSetelseres`
	`10`	`+`
	`11`	`+res=backtrack(i+1,cur)`
	`12`	`+ifres:returnres`
	`13`	`+`
	`14`	`+cur[i]="1"`
	`15`	`+res=backtrack(i+1,cur)`
	`16`	`+ifres:returnres`
	`17`	`+`
	`18`	`+returnbacktrack(0, ["0"forsinnums])`
	`19`	`+`

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