Creates a new trajectory list by inverting an existing trajectory list (meaning it unincludes all included trajectories and includes all unincluded trajectories) and then intersecting it with a second list (meaning it includes only those trajectories in both lists). The net effect of this is to include only trajectories that are not in trajectory_list 1 but are in trajectory_list 2.
invert_list <initial trajectory_list> <second trajectory_list> <name of new inverted list to be created>_