21.   Most of the motility studies on irritable bowel syndrome patients have been conducted for brief periods of time in the very distal portions of the viscus.

22.   While classical factors were often present, and for brief periods predominated, Keynesian factors were the proximate forces accounting for the rise in unemployment over this period.

23.   More and more the soldiers felt a certain indefinable malaise during their brief periods of leave at home.

24.   Although the changes do not occur overnight, positive gains often occur in a relatively brief period of time.

25.   Among those who have stayed for brief periods and longer are Bruce Chen, Andruw Jones, Odalis Perez, George Lombard, Glen Williams and others.

26.   And in the brief period that Kiriyenko has been on the national stage, he has shown himself to be an adept politician.

27.   And in that brief period, the left-hander informed them in a somewhat exasperated tone that his continual dalliances with baseball milestones hardly matter to him at all.

28.   And he can walk for brief periods with a special walker resembling a tricycle.

29.   And they gain at least one or two more rests on the bench, for brief periods, during the rest of the half.

30.   As warmer air arrives aloft from the South, a brief period of sleet or freezing rain could affect portions of northern Missouri and Illinois.