41.   The answer may lie in the unique challenges posed by the specter of bioterrorism.

42.   The bleeding poses no unique challenge for the average doctor, because it is managed in the same way as a miscarriage, Stewart said.

43.   The Mets face a unique challenge because they have no free agents.

44.   The report also focused on some unique social challenges faced by gays and lesbians.

45.   The unique challenges of raising triplets, quadruplets or more often require unique solutions.

46.   This is a unique challenge for us.

47.   Unique challenges abounded.

48.   Whether they sustain careers or bottom out fast, all of them will have to deal with the unique challenges of achieving stardom at a tender age.

49.   Pentagon officials did not predict such quick progress given the damage and the unique challenges facing rebuilders of the massive building.

50.   Keeping tabs on such an isolated spot presents a unique challenge to the EEAA.