 of the <em>flat_hash_map</em> design at CPPCON 2017 - my frustration with not being able to use it helped trigger my insight into the <em>parallel_hash_map</em>. Also many thanks to the Abseil container developers - I believe the main contributors are <em>Alkis Evlogimenos</em> and <em>Roman Perepelitsa</em> - who created an excellent codebase into which the graft of this new hashmap took easily, and finally to Google for open-sourcing Abseil. Thanks also to my son <em>Andre</em> for reviewing this paper, 