Whatever the motive, buying land outside established urban areas can be a difficult exercise.

Working out the different points is going to be a very complex and difficult exercise.

Yes, managing it will be an enormous task, a very difficult exercise.

It's not a difficult exercise to open up oneself to see.

It is not an intellectually difficult exercise to run a football club.

The women began running their damaged households - an even more difficult exercise than before.

This in itself has proved to be a difficult exercise.

It is one of the most difficult exercises we are conducting.

Ladies and gentlemen, I should tell you this is a difficult exercise.

Yet we must admit that this remains a difficult exercise.