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From Yakaboo:

This edition is specially designed for those who want to learn German perfectly. Das Neue Deutschmobil textbooks are designed for different levels of difficulty, so learning is possible both from the basics and with a certain knowledge base. A distinctive feature of the publication is that the learning material is entirely in German (German edition), including descriptions of tasks, rules and examples. This helps to fully switch attention from your native language to German, which in turn contributes to a more dynamic and effective language acquisition. The book is suitable for children and teenagers as well as adults who want to improve their German.