31.   The investigation centers on whether Opel employees sought cash kickbacks or free trips from Opel suppliers in exchange for contracts.

32.   The investigation initially centered on a grip mechanism that attaches chairs to a fast-moving cable.

33.   The original investigation centered on complaints from three phone customers, although state regulators reported hearing from dozens of consumers who said they were slammed.

34.   Investigations were centering on whether the pilots or air traffic control officers blundered, or whether equipment failure was to blame.