41.   Some lawyers have said that proving such a case could be exceedingly difficult because bribery cases usually required the cooperation of one of the parties.

42.   Team roping is an intricate sport requiring the cooperation of two skilled ropers.

43.   Terrorism and crime are two issues about which the seven leaders can agree without much controversy, because it requires only cooperation and not cash.

44.   That will require cooperation from several tribes.

45.   That will require industrywide cooperation.

46.   That requires cooperation from Israel, which demands suppression of Hamas.

47.   That requires strong cooperation between the police and medical workers.

48.   That will require improved cooperation between operating-system developers, drive manufacturers and content providers.

49.   The court would be in Cambodia and require the cooperation of the Cambodian leader, Hun Sen, who had been seeking to cripple any prospect of independent justice.

50.   The emerging strategy will require unprecedented cooperation from allies, for example, in allowing the United States access to financial networks or joining economic or trade embargoes.