nlp-utils/src/main/java/org/apache/opennlp/utils/cfg/ContextFreeGrammar.java [67:101]:
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  public String[] leftMostDerivation(String... words) {
    ArrayList<String> expansion = new ArrayList<>(words.length);

    assert words.length > 0 && startSymbol.equals(words[0]);

    for (String word : words) {
      expansion.addAll(getTerminals(word));
    }
    return expansion.toArray(new String[0]);

  }

  private Collection<String> getTerminals(String word) {
    if (terminalSymbols.contains(word)) {
      Collection<String> c = new LinkedList<>();
      c.add(word);
      return c;
    } else {
      assert nonTerminalSymbols.contains(word) : "word " + word + " is not contained in non terminals";
      String[] expansions = getExpansionForSymbol(word);
      Collection<String> c = new LinkedList<>();
      for (String e : expansions) {
        c.addAll(getTerminals(e));
      }
      return c;
    }
  }

  private String[] getExpansionForSymbol(String currentSymbol) {
    Rule r = getRuleForSymbol(currentSymbol);
    return r.getExpansion();
  }

  private Rule getRuleForSymbol(String word) {
    ArrayList<Rule> possibleRules = new ArrayList<>();
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nlp-utils/src/main/java/org/apache/opennlp/utils/cfg/ProbabilisticContextFreeGrammar.java [88:121]:
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  public String[] leftMostDerivation(String... words) {
    ArrayList<String> expansion = new ArrayList<>(words.length);

    assert words.length > 0 && startSymbol.equals(words[0]);

    for (String word : words) {
      expansion.addAll(getTerminals(word));
    }
    return expansion.toArray(new String[0]);
  }

  private Collection<String> getTerminals(String word) {
    if (terminalSymbols.contains(word)) {
      Collection<String> c = new LinkedList<>();
      c.add(word);
      return c;
    } else {
      assert nonTerminalSymbols.contains(word) : "word " + word + " is not contained in non terminals";
      String[] expansions = getExpansionForSymbol(word);
      Collection<String> c = new LinkedList<>();
      for (String e : expansions) {
        c.addAll(getTerminals(e));
      }
      return c;
    }
  }

  private String[] getExpansionForSymbol(String currentSymbol) {
    Rule r = getRuleForSymbol(currentSymbol);
    return r.getExpansion();
  }

  private Rule getRuleForSymbol(String word) {
    ArrayList<Rule> possibleRules = new ArrayList<>();
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