21.   The only obstacle to an orderly transition now is Flaherty.

22.   The only other obstacle is a small group of activists in the West Village who worry about too much commercial development.

23.   The occasional bad ballot design is not the only obstacle confronting this most loyal bloc of voters, experts say.

24.   The only obstacle is money.

25.   The only obstacle obscuring the view was a helicopter whirring above, shining a strobe light on anything that moved.

26.   The only obstacle to its immortality was Vicente Fox Quesada, a former Coca-Cola executive known for his Texan boots and big buckled belts.

27.   The season is less than a week old, but the only obstacle that seems capable of stopping the Yankees from planning for more games in October is injuries.

28.   Their only obstacle to doing so, it turned out, was their new leader.

29.   Then near the end of their journeys, they spill out onto wide, relatively uncrowded streets, where suddenly the only obstacles are traffic lights and each other.

30.   With plenty of time left in the morning, the golden trout was the only obstacle.