81.   The Food and Drug Administration has approved the first study of the illegal party drug Ecstasy as a treatment for post-traumatic stress disorder.

82.   The first study is headed by researchers at the University of Texas Southwestern Medical Center in Dallas.

83.   The first study on the increased risk of HIV infection among uncircumcised men was published a decade ago.

84.   The first study, by Cohen, showed that blacks were more than twice as likely as whites to be charged a dealer markup in the first place.

85.   The pain-relieving characteristics of marijuana have long been noted anecdotally, but these are the first studies to assess them scientifically.

86.   The report is the first authoritative study to analyze the combined effects of the budget and tax bills that President Clinton signed last month.

87.   The report is the first comprehensive national study on child-care subsidies.

88.   The results of her first study motivated Harris to design a second.

89.   The spacecraft is programmed to make the first full-scale study of Martian weather.

90.   The spacecraft, called Mars Climate Orbiter, is programmed to make the first full-scale study of Martian weather.