51.   A driving force behind the merger was the chance to cut costs and increase operating efficiency.

52.   A handsome collection of photographs, artworks and essays inspired by New York City Ballet, its stars and the driving forces behind it.

53.   A former CCRI employee at the jail who asked to remain anonymous described Wallace as a prime force behind the mistreatment of inmates.

54.   A master showman, he was the force behind a fashion credo that was about glitz, glamour, hype, youth, sex and lots of fun.

55.   A major force behind the predicted surge is the expected arrival in the market later this year of Sprint, Qwest and other communications carriers.

56.   A major puzzle is the force behind the rise.

57.   A second force behind the boom is the giant Mission Bay project.

58.   A major force behind the initiative has been Michael Horowitz, a former Reagan official who says his Jewish heritage fueled his preoccupation with the fate of evangelical Christians.

59.   A talent that hides the menacing anonymous force behind the mask of ordinary Communism.

60.   Absent from the membership list, but essentially the organizing force behind this coalition, is People for the American Way.