anchor.diff:     https://mirrors.nics.utk.edu/cran/src/contrib/caTools_1.17.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/bitops_1.0-6.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/digest_0.6.15.tar.gz \
  +   https://mirrors.nics.utk.edu/cran/src/contrib/glue_1.2.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/stringr_1.3.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/markdown_0.8.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/highr_0.6.tar.gz \
  
positive.code:    markdown_0.8.tar.gz \
     stringi_1.1.7.tar.gz \
     magrittr_1.5.tar.gz \
     stringr_1.3.0.tar.gz \
     knitr_1.20.tar.gz \
     yaml_2.1.18.tar.gz \
  
negative.code:    stringi_1.1.7.tar.gz \
     magrittr_1.5.tar.gz \
     mime_0.5.tar.gz \
     glue_1.2.0.tar.gz \
     stringr_1.3.0.tar.gz \
     highr_0.6.tar.gz \
     formatR_1.5.tar.gz \
  