"Why is the vocabulary of the demo version that limited?"

The implementation of new vocabulary requires about 30-45 minutes of time per word. Since the result of this effort allows users to learn the vocabulary is much faster, it pays off by aproximately 5 users.
To obtain a richer vocabulary, you have the following options:

• Purchase the full version.
• Help us by providing links to this page and obtain a full version for free (just contact us and mention the goodies for links program)
• Become a sponsor for a new lesson. On starting this new lesson a banner will appear "sponsored by ... [your link]". The vocabulary is provided an implemented by us. The selection of the vocabulary may be based on your suggestions and requirements - please contact us for details.
• Any help and other way of cooperation is welcome.

If you want to contribute to this project, please contact us.