About the Authors

Richard F. Lyon

Roles Conceptualization, Formal analysis, Investigation, Methodology, Software, Visualization, Writing – original draft, Writing – review & editing

dicklyon@acm.org

Affiliation Google Research, Google Inc., Mountain View, California, United States of America

Competing Interests

Author RFL is employed by Google. This does not alter RFL’s adherence to PLOS ONE policies on sharing data and materials. Google has no restrictions on this work.