11.   My own difficulties arose out of this, both in the handling of words and in the search for related images.

12.   The difficulty arises from the fact that there has been insufficient time to train new staff.

13.   Therefore, no particular difficulty arises.

14.   They can see what difficulties have arisen in the past and what corrective measures were taken to prevent their recurrence.

15.   All plans need revision from time to time and difficulties arise in reading the networks after several such changes.

16.   Similar difficulties arise in the interpretation of another study of polyp patients that showed no differences in faecal bile acid excretion.