Preface -- 1. Languages and tools -- 2. Language in the light of biological evolution -- 3. The tool hypothesis -- 4. Reciprocity in language (and beyond) -- 5. Structural variation -- 6. Functional variation -- 7. Family resemblances -- 8. The relationship to biological concepts of reciprocity -- 9. Conclusions -- Appendix A: Language information -- Appendix B: Language data sets -- Appendix C: References for figure entries -- References -- Index -- About the author.
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