anchor.diff:      https://mirrors.nics.utk.edu/cran/src/contrib/fields_9.6.tar.gz \
   #    https://mirrors.nics.utk.edu/cran/src/contrib/forecast_8.4.tar.gz \
       https://mirrors.nics.utk.edu/cran/src/contrib/ROCR_1.0-7.tar.gz \
  +    https://mirrors.nics.utk.edu/cran/src/contrib/reticulate_1.10.tar.gz \
  +    https://mirrors.nics.utk.edu/cran/src/contrib/tfruns_1.4.tar.gz \
       https://mirrors.nics.utk.edu/cran/src/contrib/tensorflow_1.9.tar.gz \
       https://mirrors.nics.utk.edu/cran/src/contrib/keras_2.2.0.tar.gz \
   #    https://mirrors.nics.utk.edu/cran/src/contrib/rstan_2.17.3.tar.gz  \
  
positive.code:     spam_2.2-0.tar.gz \
      fields_9.6.tar.gz \
  #    forecast_8.4.tar.gz \
      tensorflow_1.9.tar.gz \
      keras_2.2.0.tar.gz \
  #    rstan_2.17.3.tar.gz  \
  
negative.code:     fields_9.6.tar.gz \
  #    forecast_8.4.tar.gz \
      ROCR_1.0-7.tar.gz \
      reticulate_1.10.tar.gz \
      tfruns_1.4.tar.gz \ 
      tensorflow_1.9.tar.gz \
      keras_2.2.0.tar.gz \
  #    rstan_2.17.3.tar.gz  \
  