anchor.diff:      desc_1.2.0.tar.gz \
       pkgbuild_1.0.0.tar.gz \
       pkgload_1.0.0.tar.gz \
  +    clisymbols_1.2.0.tar.gz \
       rcmdcheck_1.2.1.tar.gz \
       sessioninfo_1.0.0.tar.gz \
       usethis_1.4.0.tar.gz \
  
positive.code: 
  RUN rm \
      modelr_0.1.2.tar.gz \
      desc_1.2.0.tar.gz \
      praise_1.0.0.tar.gz \
      rex_1.1.2.tar.gz \
  
negative.code:     https://mirrors.nics.utk.edu/cran/src/contrib/stringdist_0.9.5.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/praise_1.0.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/desc_1.2.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/clisymbols_1.2.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/bench_1.0.1.tar.gz 
  
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
  