11.  The precise reasons for the tax falloff are unclear.

12.  The precise reasons that the new approach was successful are still being worked out, he said.

13.  The precise reason for the U.S. raid remains unclear.

14.  There are probably too many unknown factors to diagnose the precise reason for the HotSync problem here.

15.  U.N. officials said the precise reasons for the shift were unclear, though they noted that HIV was spread in Africa primarily through heterosexual intercourse.

16.  Whatever their precise reasons, the sentence they rendered appeared to have been laced with ambivalence.

17.  Williams-Sonoma, for example, and other direct-merchandisers have located their distribution operations in Elvis-town for that precise reason.

18.  The precise reason for the dismissal was not immediately clear.

19.  This reporter does not know the precise reason for this constitutional quirk.

20.  He gives the example of the way people generally get angry for a precise reason, like having a cup of coffee deliberately spilt over one.