code: @Override
      public void discardFirstWords(long x) {
          while (x > 0) {
              if (this.iteratingBrlw.getRunningLength() > x) {
                  this.iteratingBrlw.discardFirstWords(x);
                  return;
              }
              this.iteratingBrlw.discardFirstWords(this.iteratingBrlw.getRunningLength());
              x -= this.iteratingBrlw.getRunningLength();
              long toDiscard = x > this.iteratingBrlw.getNumberOfLiteralWords()
                      ? this.iteratingBrlw.getNumberOfLiteralWords()
                      : x;
  
              this.iteratingBrlw.discardFirstWords(toDiscard);
              x -= toDiscard;
              if ((x > 0) || (this.iteratingBrlw.size() == 0)) {
                  if (!this.next()) {
                      break;
                  }
              }
          }
      }
docs: Discard first words, iterating to the next running length word if
  needed.
  
  @param x the number of words to be discarded