51.   By themselves, technological changes have always presented a challenge to individual privacy rights.

52.   Creating this future presents formidable challenges.

53.   Data base mapping, however, presents a challenge.

54.   Days and nights in the wilderness, far from the amenities of city life, present a challenge.

55.   Donovan has presented the challenge, now he can only wait to see if it works.

56.   Despite all the buzz about the new designs, the new era presents new challenges for PC makers, said Kay of IDC.

57.   Despite their limited resources, the Cougars could present a challenge to the Matadors on offense.

58.   Even for the seasoned wedding professional, working on a same-sex ceremony presents special challenges.

59.   Even issues with broad support and plenty of major-impact potential present a challenge to legislators eager to wrap up business on time.

60.   Even the weaker opponents should present a challenge as the Lakers try to extend a nine-game road winning streak.