21.   Aerial photographs have been taken to determine the extent of the problem.

22.   Brymer, meanwhile, underwent X-rays Sunday morning and the results will be evaluated by team doctors this morning to determine the extent of the fracture.

23.   But he also disclosed that X-rays taken in Chicago to determine the extent of his medial collateral ligament injury revealed damage to a second ligament.

24.   But he challenged state and local police forces to follow his lead in determining the extent of the practice.

25.   Charissis is expected to undergo X-rays today to determine the extent of an ankle injury he suffered against Arizona last weekend.

26.   Currently, dentists use X-rays to determine the extent of the disease.

27.   Defensive tackle Bernard Riley will have a magnetic-resonance imaging test today to determine the extent of his knee injury.

28.   Determining the extent of the suffering has been difficult because the people of Maine are not prone to complaining.

29.   Determining the extent of the fad is difficult.

30.   Diplomats say the two cases illustrate the role of outside political pressure in determining the extent of U.N. involvement in regional conflicts.