anchor.diff:  
   # Clean up
   WORKDIR /home
  -RUN apt-get remove -y git
  -RUN apt-get -y autoremove
  -RUN rm -rf Tango/
  +RUN apt-get remove -y git && apt-get -y autoremove && rm -rf Tango/
   
   # Check installation
   RUN ls -l /home
  
positive.code: RUN chown autolab:autolab autolab
  RUN chown autolab:autolab output
  RUN chown autograde:autograde autograde
  RUN apt-get install -y git
  RUN git clone https://github.com/autolab/Tango.git
  WORKDIR Tango/autodriver
  RUN make clean && make
  RUN cp autodriver /usr/bin/autodriver
  
negative.code: # Autolab - autograding docker image
  
  FROM ubuntu:18.04
  MAINTAINER Autolab Team <autolab-dev@andrew.cmu.edu>
  
  RUN apt-get update && apt-get install -y \
    build-essential \
    gcc \
    git \
    make \
    sudo \
    && rm -rf /var/lib/apt/lists/*
  
  # Install autodriver
  WORKDIR /home
  