anchor.diff:     DBI_0.8.tar.gz \
      tibble_1.4.2.tar.gz \
      bindr_0.1.1.tar.gz \
  -   bindrcpp_0.2.tar.gz \
  +   bindrcpp_0.2.2.tar.gz \
      glue_1.2.0.tar.gz \
      pkgconfig_2.0.1.tar.gz \
  -   plogr_0.1-1.tar.gz \
  +   plogr_0.2.0.tar.gz \
      dplyr_0.7.4.tar.gz 
   
   RUN DEBIAN_FRONTEND=noninteractive wget \
  
positive.code:    https://mirrors.nics.utk.edu/cran/src/contrib/openintro_1.7.1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/tibble_1.4.2.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/bindr_0.1.1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/bindrcpp_0.2.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/glue_1.2.0.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/pkgconfig_2.0.1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/plogr_0.1-1.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/dplyr_0.7.4.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/assertthat_0.2.0.tar.gz \
     https://mirrors.nics.utk.edu/cran/src/contrib/R6_2.2.2.tar.gz \
  
negative.code:    tibble_1.4.2.tar.gz \
     glue_1.2.0.tar.gz \
     pkgconfig_2.0.1.tar.gz \
     plogr_0.2.0.tar.gz \
     bindr_0.1.1.tar.gz \
     bindrcpp_0.2.2.tar.gz \
     dplyr_0.7.4.tar.gz 
  
  RUN rm \
  