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Given a text, write a compressed version of it in a single sentence.

Many units were simply instructed to ascend toward the impact zone and report back to the lobby via radio. Some units were directed to assist specific groups of individuals trapped in elevators or in offices well below the impact zone.
Output:
Many units were simply instructed to ascend toward the impact zone and report to the lobby via radio. Some units were directed to assist specific groups trapped in elevators.