21.   But because those studies were smaller and less rigorous than the new one, officials said, it was hard to make direct comparisons with them.

22.   But because the studies are being run in different ways, direct comparison of findings is impossible.

23.   But motorists do not necessarily make such direct comparisons.

24.   But since I had no common recordings in both Super Audio CD and DVD-Audio format, I was unable to do a direct comparison.

25.   But whether Enbrel will displace methotrexate is not clear because a direct comparison of the two drugs has not been completed.

26.   Cruickshank said the new price cap is based on direct comparisons with efficiency at the U.S. regional Bell telephone companies.

27.   Derivatives of both types have grown, though they are measured in different ways, making direct comparisons difficult.

28.   Direct comparisons between cultural budgets are therefore tricky.

29.   Direct comparisons to the amount of money Gingrich raised are difficult to make, House Republicans say, mostly because members add up their dollars in different ways.

30.   Direct comparisons to the year earlier will be difficult, since the company last year both bought Wellcome and changed its reporting period to end in December.