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A year after returning from his first solidarity leave in sub-Saharan Africa, David has only one desire: to go back and train other people. His first experience dates from last November. This 37-year-old from Nantes flew to Douala, the economic capital of Cameroon, to help, alone for two weeks, the members of a local association committed to biodiversity to use Word and Excel. In charge of demographic studies, he uses this software every day and felt able to learn how to use it.