comefrom: <awangdev>1048. Longest String Chain_2.java
code: private List[] buildBucket(String[] words) {
  
          List[] bucket = new List[17];
          for (String w : words) {
              int len = w.length();
              if (bucket[len] == null) bucket[len] = new ArrayList<>();
              bucket[len].add(w);
          }
          return bucket;
      }
masked: private List [ ] var_0 ( String [ ] var_2 ) {
    List [ ] var_5 = new List [ 17 ] ;
    for ( String var_6 : var_2 ) {
      int var_8 = var_6 . length ( ) ;
      if ( var_5 [ var_8 ] == null ) var_5 [ var_8 ] = new ArrayList < > ( ) ;
      var_5 [ var_8 ] . add ( var_6 ) ;
    }
    return var_5 ;
  }
  