code: private static int[] pad(int[] list) {
          double m = list.length / (double)WORD_LENGTH;
          int size = (int)Math.ceil(m);
          int[] ret = new int[size * WORD_LENGTH];
          Arrays.fill(ret, 0);
          System.arraycopy(list,0,ret,0,list.length);
          return ret;
      }
docs: Increases the array size to a multiple of WORD_LENGTH
  
  @param list
  @return