Teacher:Given a text, write a compressed version of it in a single sentence.
Teacher: Now, understand the problem? Solve this instance: Two on-duty NYPD officers were on the 20th floor of the North Tower at 8:46. They climbed to the 29th floor, urging civilians to evacuate, but did not locate a group of civilians trapped on the 22nd floor.
Student:
2 NYPD cops were on the 20th fl of the N Tower at 8:46. They climbed to the 29th flr urging evacuation, but didn't anyone on the 22nd floor.