21.   Communications companies are often slow to bring new services to New York City because the sheer scale of the city can pose unique technical challenges.

22.   Each solution has its own unique challenges, he said.

23.   F.M. Carroll, director of operations at Texas Motor Speedway, said the design offers a unique challenge to project contractors.

24.   Fishing with kids presents a unique challenge that, for the unprepared angler, can ruin any trip.

25.   For Farrell, the case has posed some unique challenges.

26.   Foreign travel offers some unique challenges, not the least of which is translating the local signs.

27.   Handling the feelings they provoke is part of the unique challenge of being an adoptive parent.

28.   Given their size and sizeable market shares, Procter faces a unique challenge.

29.   It looked like a unique challenge.

30.   Leaving The Woodlands will present unique challenges to the HGA.