41.   All involve the use of unmarked police cars.

42.   But doing that involves the use of expensive photographic paper.

43.   But Jacobs said that any deal involving the use of facilities at the Johnson center or the habitation quarters on board the space station would require congressional approval.

44.   But they will work only if the countries involved use the respite to pursue good policies.

45.   Card issuers say they most often encounter disputes involving unauthorized use of a card and billing errors.

46.   Change usually involves heavy use of economic incentives, drastic layoffs, downsizing and restructuring.

47.   Cheating can involve the use of masking agents or chemicals that are added to drug testing specimens in an attempt to defeat the process.

48.   Chinese sports have also been tarnished by repeated scandals involving use of performance-enhancing drugs, though the government has vowed to clean up the problem.

49.   Crimes involving the use of weapons were up slightly this year, but gun possession went down by a couple of percentage points.