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3. Bush E. C. (2018b). Biology 52 genetic distances homework assignment. https://sites.google.com/a/g.hmc.edu/bio52-2018/ast/code-distances
4. Bush E. C. (2018c). Biology 52 neighbor-joining assignment. https://sites.google.com/a/g.hmc.edu/bio52-2018/ast/code-hivtree
5. Bush E. C. (2018d). Biology 52 estimating when HIV entered the human population. https://sites.google.com/a/g.hmc.edu/bio52-2018/ast/code-origintime