anchor.diff:  RUN rm \
      openintro_1.4.tar.gz \
      assertthat_0.2.0.tar.gz \
  -   R6_2.2.0.tar.gz \
  +   R6_2.2.1.tar.gz \
      magrittr_1.5.tar.gz \
      lazyeval_0.2.0.tar.gz \
      DBI_0.6-1.tar.gz \
  
positive.code:    stringr_1.2.0.tar.gz \
     roxygen2_5.0.1.tar.gz \
     BH_1.62.0-1.tar.gz \
     XML_3.98-1.6.tar.gz \
     xml2_1.1.1.tar.gz \
     curl_2.4.tar.gz \
     rversions_1.0.3.tar.gz \
     git2r_0.18.0.tar.gz \
     devtools_1.12.0.tar.gz \
     downloader_0.4.tar.gz
  
     
  
negative.code:    rstudioapi_0.6.tar.gz \
     withr_1.0.2.tar.gz \
     git2r_0.18.0.tar.gz \
     devtools_1.13.1.tar.gz \
     brew_1.0-6.tar.gz \
     stringi_1.1.5.tar.gz \
     magrittr_1.5.tar.gz \
     stringr_1.2.0.tar.gz \
     roxygen2_5.0.1.tar.gz \
     XML_3.98-1.7.tar.gz \
     BH_1.62.0-1.tar.gz \
     xml2_1.1.1.tar.gz \
     rversions_1.0.3.tar.gz \
  