51.   Others, such as Birmingham and Cellucci, point to the recent history of cooperation on some issues between the legislative and executive branches.

52.   Porsche is in talks with Volkswagen AG and another European carmaker over a possible cooperation on developing the vehicle.

53.   Rookie drivers do not tend to get much cooperation on the racetrack.

54.   Ross has been trying to get the two sides to sign a memorandum elucidating their cooperation on security issues.

55.   Rice, a scholar on Russia and the former Soviet Union, acknowledged Thursday that a broad agenda of difficult issues will follow the cooperation on terrorism.

56.   Scientists were also demanding a standardized system to facilitate international cooperation on research.

57.   Such research is precisely the point of this joint US-Russian mission, far more ambitious than any previous attempt at international cooperation on a space venture.

58.   Such a law could stir resentment abroad, impeding cooperation on the vital issue of preventing Iran from developing nuclear weapons.

59.   The agreement formalized a dramatic shift from the era of Cold War confrontation to a new cooperation on security issues and terrorism.

60.   The board is asking for better international cooperation on controlling these sales, since national laws and policies differ.