old_contents: from cistar.envs.two_intersection import TwoIntersectionEnvironment
  from cistar.envs.loop_accel import *
  from cistar.envs.lane_changing import *
  from cistar.envs.loop_merges import SimpleLoopMergesEnvironment
  
new_contents: from cistar.envs.two_intersection import TwoIntersectionEnvironment
  from cistar.envs.two_intersection_multi import TwoIntersectionMultiAgentEnvironment
  from cistar.envs.loop_accel import *
  from cistar.envs.lane_changing import *
  from cistar.envs.loop_merges import SimpleLoopMergesEnvironment
  
subject: Revert "removed missing environments"