comefrom: <doocs>1436.Destination City_1.py
code: def destCity( paths: List[List[str]]) -> str:
      s = {a for a, _ in paths}
      return next(b for _, b in paths if b not in s)
masked: def sample_funcname ( var_0 : List [ List [ str ] ] ) -> str :
      var_3 = { var_1 for var_1 , var_2 in var_0 }
      return next ( var_4 for var_2 , var_4 in var_0 if var_4 not in var_3 )
  