31.   But if Exxon and Mobil agree to become one, antitrust regulators are likely to be cautious about putting back together much of what they long ago broke apart.

32.   But FCC regulators were most concerned about whether American communications companies would be able to compete effectively against Concert in Britain.

33.   But in the evolving area of Internet gambling, not even federal gambling regulators are sure they have the authority.

34.   But just months after the purchase, state regulators were seeing a growing number of complaints against Missouri Gas.

35.   But regulators are dubious.

36.   But regulators are worried that such software may get the public too close to the action.

37.   But local regulators are powerless to rein in the emissions.

38.   But only now are regulators beginning to examine light truck collisions with cars.

39.   But the European and U.S. regulators are almost sure to coordinate their demands.