install.packages("ape", repos = "http://cran.uk.r-project.org")
install.packages("devtools", repos = "http://cran.uk.r-project.org")
install.packages("gridExtra", repos = "http://cran.uk.r-project.org")
install.packages("knitr", repos = "http://cran.uk.r-project.org")
install.packages("lintr", repos = "http://cran.uk.r-project.org")
install.packages("rmarkdown", repos = "http://cran.uk.r-project.org")
install.packages("testit", repos = "http://cran.uk.r-project.org")
install.packages("testthat", repos = "http://cran.uk.r-project.org")
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