1.   A further problem arises from the fact that the experimental results of critical importance are far from clear-cut.

2.   A major problem arose from the way in which the adjustable peg system was operated.

3.   A methodical fellow, Zubkoff discovered that his problem arose only when he processed his film during the day.

4.   A similar problem arises when the deferred consequences are positively reinforcing.

5.   Advice and guidance is provided in setting up the business and thereafter should any problems arise.

6.   Another major problem can arise in house price differentials.

7.   Both formal and informal networks tended to divide into sub-networks and problems arose when these were not brought closely together.

8.   Complex problems can arise where one of the purposes is lawful and one is regarded as unlawful.