21.   However, bands of moisture will move across the local region from time to time, producing brief intervals of cloudiness and a few light passing showers.

22.   However, patches of moisture will move across the region from time to time making for brief intervals of cloudiness and a few showers.

23.   On race day he got away to a perfect start and never relinquished his lead except for brief intervals after his two pit stops.

24.   Schumacher started from the pole and never relinquished his lead except for brief intervals after his two pit stops.

25.   Schumacher started from the pole and never relinquished his lead except for brief intervals after two pit stops to retain the title.

26.   The deputy secretary said flights by the U.S.-led air force to patrol northern Iraq resumed recently after a brief interval.