anchor.diff:     https://mirrors.nics.utk.edu/cran/src/contrib/googlesheets_0.2.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/hms_0.3.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/readr_1.1.1.tar.gz \
  -   https://mirrors.nics.utk.edu/cran/src/contrib/purrr_0.2.2.2.tar.gz \
  +   https://mirrors.nics.utk.edu/cran/src/contrib/purrr_0.2.3.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/selectr_0.3-1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/rvest_0.3.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/pbkrtest_0.4-7.tar.gz 
  
positive.code:    googlesheets_0.2.2.tar.gz \
     hms_0.3.tar.gz \
     readr_1.1.1.tar.gz \
     purrr_0.2.2.2.tar.gz \
     selectr_0.3-1.tar.gz \
     rvest_0.3.2.tar.gz \
     pbkrtest_0.4-7.tar.gz 
  
negative.code:    tidyr_0.6.3.tar.gz \
     hms_0.3.tar.gz \
     readr_1.1.1.tar.gz \
     purrr_0.2.3.tar.gz \
     googlesheets_0.2.2.tar.gz \
     selectr_0.3-1.tar.gz \
     rvest_0.3.2.tar.gz \
  