21.   According to the World Book Encyclopedia, outdoor dust contains mineral material from plowed fields, river flood plains and the floors of deserts.

22.   All he must do is steal a videotape that contains compromising material on a presidential candidate.

23.   All across America, grocery stores and retail chains are refusing to sell magazines that contain material thought to be objectionable to their customers.

24.   But all do an effective job of limiting access to websites and newsgroups that may contain objectionable material.

25.   But Giles said that some of the newsgroups had names that made it seem unlikely that they contained obscene materials.

26.   But it contains fascinating material.

27.   But prosecutors said the newsgroups contained materials that violated German obscenity laws, and that CompuServe must stop distributing the material in Munich.

28.   But the book will contain somber material, too.

29.   But surely no one believes it was the only BBS that contained materials that might be challenged by law-enforcement agencies.

30.   But these include pages that were later removed by site owners because they contained material that was pirated, illegal or deemed too sensitive.