anchor.diff:     formatR_1.4.tar.gz \
      highr_0.6.tar.gz \
      markdown_0.7.7.tar.gz \
  -   stringi_1.1.5.tar.gz
  - \
  +   stringi_1.1.5.tar.gz \
      magrittr_1.5.tar.gz \
      stringr_1.2.0.tar.gz \
      knitr_1.15.1.tar.gz \
  
positive.code:    http://archive.linux.duke.edu/cran/src/contrib/openssl_0.9.6.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/withr_1.0.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/brew_1.0-6.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stringi_1.1.5.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/Archive/roxygen2/roxygen2_5.0.1.tar.gz \
  
negative.code:    http://archive.linux.duke.edu/cran/src/contrib/formatR_1.4.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/evaluate_0.10.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/mime_0.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/stringi_1.1.5.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/magrittr_1.5.tar.gz
  
  
  