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_5 = { var_3 for var_3 , var_4 in var_0 }
      return next ( var_7 for var_4 , var_7 in var_0 if var_7 not in var_5 )
  