!747

m {

  static S sentence1 = "Yes is the opposite of no. No is the opposite of yes.";

  static S sentence2 = "Green is the opposite of white.";

  p {

    L<S> tok1 = parse(sentence1);

    L<S> tok2 = parse(sentence2);

    Map<S, S> map = makeMapPrefix(tok1, tok2);

    if (map == null)

      print("No match.");

    else

      print(structure(map));

    print(complete(sentence1, sentence2));

  }

  static L<S> parse(S s) {

    return tokensToLowerCase(javaTok(s));

  }

  static S complete(S sentence1, S sentence2) {

    L<S> tok1 = parse(sentence1);

    L<S> tok2 = parse(sentence2);

    Map<S, S> map = makeMapPrefix(tok1, tok2);

    if (map == null) return null;

    new L<S> tok;

    tok.addAll(tok2.subList(0, tok2.size()-1));

    for (int i = tok2.size()-1; i < tok1.size(); i++) {

      S t = tok1.get(i);

      S x = map.get(t);

      tok.add(x != null ? x : t);

    }

    return join(tok);

  }

  static Map<S, S> makeMapPrefix(L<S> tok1, L<S> tok2) {

    if (tok1.size() < tok2.size()) return null;

    new Map<S, S> map;

    for (int i = 1; i < tok2.size(); i += 2) {

      S t1 = tok1.get(i), t2 = tok2.get(i);

      if (!t1.equals(t2)) {

        S v = map.get(t1);

        if (v == null)

          map.put(t1, t2);

        else if (!v.equals(t2))

          return null; // match fail

      }

    }

    // match succeeds

    return map;

  }

}