41.   The county is perceived as a closed system and it is a cultural phenomenon born out of the way the county has done business for decades.

42.   The guest, former President George Bush, praised Gorbachev for his courage in opening the closed Soviet system to internal criticism and to accommodation with old foes.

43.   The two neighboring organs are connected by a closed labyrinthine system of fluid-filled ducts and sacs.

44.   These plants, nourished by human waste, could help recycle air and water in a closed system.

45.   This is accomplished hydraulically, with brake fluid, which is contained in a closed system of cylinders, plungers, seals and tubing.

46.   Unable to gain access to a closed system, they mistakenly believed that protective service agencies were already involved.

47.   Until very recently, his company had the most closed system of the three leading providers.

48.   Volk is a principal investigator with the National Aeronautics and Space Administration who studies crop growth in closed systems.

49.   What she found was a closed system that generates distrust among political insiders and the press that covers them.

50.   While efficient, smart and capable, Putin made his share of mistakes, like fostering a closed system of private business deals and monopolies.