61.   The treaty contained an elaborate system of credits to nations for less-polluting power plants and other environmental improvements.

62.   There is talk, not all of it fantasy, of elaborate systems of bridges and tunnels to connect the Jewish neighborhoods.

63.   They had set up an elaborate electronic system of signal stealing relayed from a spy positioned in their center-field clubhouse.

64.   They said he had dug an elaborate system of tunnels.

65.   This is happening at the same time that the president is insisting on an elaborate system of testing to measure student performance.

66.   They were the passengers on the Underground Railroad, the elaborate system of escape spawned by American slavery.

67.   To avoid prosecution, the Web site operators would have to use an elaborate system to verify the age of those seeking access.

68.   U.S. commanders have established an elaborate refueling system involving U.S. Air Force strategic tankers and Navy carrier-based refuelers.

69.   When the Soviet Union fell apart, so did the elaborate system of subsidies and supports that propped up so many parts of the country.

70.   When the trial started, Viacom prepared to test an elaborate system including video on demand, interactive games, and shopping.