source: [lemma=stop] [□] □ □
destination: [lemma=stop] [□=□] □ □
spec: The next two occur in response to the teacher upping the ante , and the fourth occurs in response to Conrad , not to a teacher prompt . Lowell Bollinger and his team barely stopped long enough to celebrate the dedication of the world 's first superconducting heavy ion accelerator , ATLAS , before they added a new injector .