anchor.diff:     data.table_1.9.6.tar.gz \
      rematch_1.0.1.tar.gz \
      cellranger_1.1.0.tar.gz \
  -   tidyr_0.5.1.tar.gz \
  +   tidyr_0.6.0.tar.gz \
      hms_0.2.tar.gz \
      readr_1.0.0.tar.gz \
      purrr_0.2.2.tar.gz \
  
positive.code:    http://archive.linux.duke.edu/cran/src/contrib/data.table_1.9.6.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/rematch_1.0.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/cellranger_1.1.0.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/tidyr_0.5.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/googlesheets_0.2.1.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/hms_0.2.tar.gz \
     http://archive.linux.duke.edu/cran/src/contrib/readr_1.0.0.tar.gz \
  
negative.code:    data.table_1.9.6.tar.gz \
     rematch_1.0.1.tar.gz \
     cellranger_1.1.0.tar.gz \
     tidyr_0.6.0.tar.gz \
     googlesheets_0.2.1.tar.gz \
     hms_0.2.tar.gz \
     readr_1.0.0.tar.gz \
  