21.   Only she and Mr Cohen had complete sets of keys to the shop.

22.   An objective set of rules which we all agree to accept is necessary for any ordered society.

23.   Combined with the economics of manufacture and purchasing, these factors create a complex set of conditions to be considered in making the decision.

24.   Elementary schools were free and governed under one set of regulations.

25.   In all of that time on the continent we did not encounter one set of road works, one traffic jam or one police car.

26.   Excluding Nature, which publishes papers in all of the sciences, this core set of journals is specifically geological, but not specifically Scottish, apart from SJG.

27.   There are a whole set of statistical techniques for assessing the probability that the observed differences between the two groups could have resulted from chance.

28.   To this third set of pictures he added appropriate disapproving comments and cut them into the action.

29.   Wirth gave special emphasis to the social-cum-physical setting of cities as themselves giving rise to secondary and partial human association.