31.   An architectural engineer is trying to ensure its subterranean past is not forgotten.

32.   Army engineers were trying to clear the road.

33.   At this point, engineers are merely trying to figure out what went wrong.

34.   But search and rescue operations were on hold Friday as engineers tried to reinforce the building, which was in danger of collapse.

35.   Earlier Sunday, rescuers crept gingerly through the building as engineers tried to reinforce weakened columns that threatened to collapse around them.

36.   Earlier Sunday, rescuers crept gingerly through the debris as structural engineers tried to reinforce two weakened columns that threatened to collapse, bringing down more concrete slabs.

37.   Engineers were trying to determine if the temperature difference may have weakened the bearings.

38.   Engineers were trying to reduce the flow of water on the Arkansas.

39.   Engineers were trying to restore road links, he said on condition of anonymity.

40.   Government engineers are trying to figure out the best way to tell prospective buyers the probability that a vehicle would roll over in a crash.