anchor.diff:      https://mirrors.nics.utk.edu/cran/src/contrib/listenv_0.7.0.tar.gz \
       https://mirrors.nics.utk.edu/cran/src/contrib/foreach_1.4.4.tar.gz \
       https://mirrors.nics.utk.edu/cran/src/contrib/iterators_1.0.10.tar.gz \
  +    https://mirrors.nics.utk.edu/cran/src/contrib/enc_0.2.0.tar.gz \
  +    https://mirrors.nics.utk.edu/cran/src/contrib/rematch2_2.0.1.tar.gz \
       https://mirrors.nics.utk.edu/cran/src/contrib/bench_1.0.1.tar.gz 
   
   RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
  
positive.code: 
  RUN rm \
      modelr_0.1.2.tar.gz \
      ps_1.1.0.tar.gz \
      globals_0.12.2.tar.gz \
      foreach_1.4.4.tar.gz \
  
negative.code:     tidygraph_1.1.0.tar.gz \
      here_0.1.tar.gz \
      rticles_0.5.tar.gz \
      enc_0.2.0.tar.gz \
      rematch2_2.0.1.tar.gz \
      styler_1.0.2.tar.gz \
      lintr_1.0.2.tar.gz \
      testthat_2.0.0.tar.gz \
  