anchor.diff:     magrittr_1.5.tar.gz \
      lazyeval_0.2.0.tar.gz \
      DBI_0.6.tar.gz \
  -   tibble_1.2.tar.gz \
  +   tibble_1.3.0.tar.gz \
      dplyr_0.5.0.tar.gz 
   
   RUN DEBIAN_FRONTEND=noninteractive wget \
  
positive.code:    magrittr_1.5.tar.gz \
     lazyeval_0.2.0.tar.gz \
     DBI_0.6.tar.gz \
     tibble_1.2.tar.gz \
     dplyr_0.5.0.tar.gz 
  
  RUN rm \
  
negative.code:    reshape2_1.4.2.tar.gz \
     assertthat_0.1.tar.gz \
     lazyeval_0.2.0.tar.gz \
     tibble_1.3.0.tar.gz \
     ggplot2_2.2.1.tar.gz \
     stargazer_5.2.tar.gz \
     minqa_1.2.4.tar.gz \
  