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Are you Jan Höpker, author of the books below?
Erfolg durch Fokus und Konzentration by Jan Höpker Praktische Selbstmotivation by Jan Höpker Erfolg durch selbstbestimmtes Lernen by Jan Höpker Persönlichkeitsentwicklung Jumpstart by Jan Höpker In Teilzeit zum Millionär by Frank Linke


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