anchor.diff:      fs_1.2.6.tar.gz \
       reprex_0.2.0.tar.gz \
       gh_1.0.1.tar.gz \
  -    glue_1.3.0.tar.gz \
       microbenchmark_1.4-4.tar.gz \
       bench_1.0.1.tar.gz 
   
  
positive.code:     https://mirrors.nics.utk.edu/cran/src/contrib/fs_1.2.6.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/reprex_0.2.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/gh_1.0.1.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/glue_1.3.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/microbenchmark_1.4-4.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/modelr_0.1.2.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/clipr_0.4.1.tar.gz \
  
negative.code: 
  RUN rm \
     jsonlite_1.5.tar.gz \
     memoise_1.1.0.tar.gz \
     whisker_0.3-2.tar.gz \
     bitops_1.0-6.tar.gz \
     RCurl_1.95-4.11.tar.gz \
     plyr_1.8.4.tar.gz \
     R6_2.2.2.tar.gz \
     httr_1.3.1.tar.gz \
     rstudioapi_0.7.tar.gz \
     openssl_1.0.2.tar.gz \
  