anchor.diff:  
   RUN rm \
       nycflights13_1.0.0.tar.gz \
  -    abynames_0.3.0.tar.gz \
  +    babynames_0.3.0.tar.gz \
       janeaustenr_0.1.5.tar.gz \
       NHANES_2.1.0.tar.gz \
       repurrrsive_0.1.0.tar.gz \
  
positive.code: 
  RUN DEBIAN_FRONTEND=noninteractive R CMD INSTALL \
      nycflights13_1.0.0.tar.gz \
      abynames_0.3.0.tar.gz \
      janeaustenr_0.1.5.tar.gz \
      NHANES_2.1.0.tar.gz \
      repurrrsive_0.1.0.tar.gz \
  
negative.code: 
  RUN DEBIAN_FRONTEND=noninteractive wget \
      https://mirrors.nics.utk.edu/cran/src/contrib/nycflights13_1.0.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/babynames_0.3.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/janeaustenr_0.1.5.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/NHANES_2.1.0.tar.gz \
      https://mirrors.nics.utk.edu/cran/src/contrib/repurrrsive_0.1.0.tar.gz \
  