11.   But one postal union official offered a theory -- quickly rebutted by an official in Washington -- that post offices in calm, well-to-do areas are easy prey.

12.   But they offer several theories.

13.   Callister, the former councilman, offers several theories.

14.   Census Bureau officials did not offer any theories for the racial and ethnic differences in response rates.

15.   Dafoe said that to clear Jones of any malice, but Kings forward Tony Granato offered another theory why Jones acted that way.

16.   Denver offers a few theories for his disappearance from the charts.

17.   Diverse delegates at the convention offer their theories as to why.

18.   Dr. David Spiegel, a psychiatrist at the Stanford University School of Medicine, offered another theory.

19.   Economists have offered many theories for the growing inequality, including the spread of computers, cutbacks in welfare programs and growing trade with low-wage countries.

20.   Frank Reysen Jr., editor of Playthings magazine, offered another theory.