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Liebal,  Katja
Evolutionary Roots of Human Social Interaction, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

Pika,  Simone
Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

Tomasello,  Michael
Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;