comefrom: <awangdev>78. Subsets_4.java
code: private List<Integer> buildResult(List<Integer> indexRow, int[] nums) {
  
          List<Integer> list = new ArrayList<>();
          for (int index : indexRow) list.add(nums[index]);
          return list;
      }
masked: private List < Integer > var_1 ( List < Integer > var_3 , int [ ] var_4 ) {
    List < Integer > var_6 = new ArrayList < > ( ) ;
    for ( int var_7 : var_3 ) var_6 . add ( var_4 [ var_7 ] ) ;
    return var_6 ;
  }
  