31.   But Francis said that to find the cause of the crash, big pieces of the plane were not necessary.

32.   But if no cause is found, mechanical failure would probably become the explanation by default.

33.   But no cause could be found in many of the children.

34.   But officials at both agencies hold out little hope of finding a cause of an accident that left neither witnesses nor a vessel.

35.   But Irvin had found a cause, and he was in an uproar.

36.   But of the two crashes, the FAA administrator, David Hinson, said no obvious cause had been found.

37.   But some analysts find cause for hope.

38.   But some Greek prelates find cause for alarm in the renaissance of the Russian church.

39.   But they said the rocket sent back a wealth of good telemetry data to ground tracking stations that can be analyzed to help find the cause.

40.   Characterizing both problems as significant, agency officials said they would work aggressively to find the causes.