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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Arfon M Smith wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Daniel S Katz wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Kyle E Niemeyer wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate, collect or analyse any raw data or code.

Funding

Work by D. S. Katz was supported by the National Science Foundation (NSF) while working at the Foundation; any opinion, finding, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the NSF. Work by K. E. Niemeyer was supported in part by the NSF under grant ACI-1535065. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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