21.   A significant difference exists, however.

22.   But Congress and the White House are unlikely to find compromise if one side insists the differences do not exist.

23.   But the breakdown in the talks on Tuesday showed that significant differences also exist among tobacco companies.

24.   But the British study was not designed to determine whether such viral differences existed among the participants.

25.   But the stark differences still exist between the programs.

26.   But these differences exist, and they need to be constructively aired and debated.

27.   Considerable differences also exist in policies and practices for dealing with terrorist incidents and groups.

28.   Considerable differences still exist between the allies and Russia on how many Russian troops would be deployed in the force and where in Kosovo they would be deployed.

29.   Differences exist between the present-day GOP agenda and details of the Other Constitution.

30.   Differences still exist.