21.   At the end of the study, the scientists found no difference between the treated and untreated groups.

22.   Beginner users will be hard-pressed to find significant differences.

23.   Big differences can be found in little phrases.

24.   Bradley has had difficulty finding philosophical differences with which to rally liberal activists, union members, and other primary voters.

25.   A Florida study found no difference in cocaine use between pregnant women who use public clinics and women who saw private doctors.

26.   A General Accounting Office audit released Wednesday found dramatic differences in the designs and finishes for federal courthouses.

27.   A more subtle difference can be found in how words are stressed in phrases.

28.   A more dramatic difference can be found hidden on the favorites or bookmark lists of male and female users.

29.   A survey has found big differences in what brokerages charge in commissions and for various services, emphasizing the need for investors to shop around.

30.   Aides said Clinton also was struck by a Gallup poll released Tuesday that found major differences in perceptions about racism.