anchor.diff:     backports_1.1.3.tar.gz \
      rprojroot_1.3-2.tar.gz \
      desc_1.2.0.tar.gz \
  -   magrittr_1.5.tar.gz \
      prettyunits_1.0.2.tar.gz \
      withr_2.1.2.tar.gz \
      pkgbuild_1.0.2.tar.gz \
  
positive.code:    askpass_1.1.tar.gz \
     openssl_1.2.2.tar.gz \
     brew_1.0-6.tar.gz \
     magrittr_1.5.tar.gz \
     roxygen2_5.0.1.tar.gz \
     BH_1.69.0-1.tar.gz \
     XML_3.98-1.19.tar.gz \
  
negative.code: RUN rm \
     openintro_1.7.1.tar.gz \
     assertthat_0.2.0.tar.gz \
     DBI_1.0.0.tar.gz \
     bindr_0.1.1.tar.gz \
     bindrcpp_0.2.2.tar.gz \
     pkgconfig_2.0.2.tar.gz \
  