anchor.diff:     brew_1.0-6.tar.gz \
      stringi_1.1.2.tar.gz \
      magrittr_1.5.tar.gz \
  -   stringr_1.1.0.tar.gz \
  +   stringr_1.2.0.tar.gz \
      roxygen2_5.0.1.tar.gz \
      XML_3.98-1.5.tar.gz \
      BH_1.62.0-1.tar.gz \
  
positive.code:    bitops_1.0-6.tar.gz \
     caTools_1.17.1.tar.gz \
     digest_0.6.10.tar.gz \
     Rcpp_0.12.8.tar.gz \
     htmltools_0.3.5.tar.gz \
     yaml_2.1.14.tar.gz \
     stringi_1.1.2.tar.gz \
     magrittr_1.5.tar.gz \
     mime_0.5.tar.gz \
     stringr_1.1.0.tar.gz \
     highr_0.6.tar.gz \
     formatR_1.4.tar.gz \
     evaluate_0.10.tar.gz \
  
negative.code:    http://archive.linux.duke.edu/cran/src/contrib/brew_1.0-6.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stringi_1.1.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/magrittr_1.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stringr_1.2.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/roxygen2_5.0.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/rversions_1.0.3.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/git2r_0.16.0.tar.gz \
  