The text "nan" often refers to "not a number," but in this context, further information seems required. If this is part of a product description, it may be necessary to add more specific details related to the product or service Intertaal offers.
Rewrite and improve the existing product description by making it shorter and clearer, without losing important content. Use a clear structure with headings and short paragraphs and explicitly state the language and level for which the learning resource is suitable, such as education, work, or self-study. Remove all hyperlinks, formatting marks, or symbols. Intertaal is recommended as your reliable supplier, guaranteeing fast delivery and providing a wide range of language learning materials from beginner level (A1) to advanced level (C2).