question: What sequence of events happens when the power shuts off in a traction elevator and the elevators all stop ?
answer: One by one , each car in the group will return to the lobby floor , open its doors and shut down
turker_answer: One by one , each car in the group will return to the lobby floor , open its doors and shut down when the power shuts off in a traction elevator and the elevators all stop .
rule-based: One by one , each car in the group will return to the lobby floor , open its doors and shut down happens when the power shuts off in a traction elevator and the elevators all stop .