21.   New editions will essentially be cumulations and therefore a longer gap will exist between editions.

22.   No natural boundary appears to exist between the natural and social sciences.

23.   No treaty currently exists between the two countries.

24.   Not surprisingly an inverse relationship existed between the proportion of labourers and that of lower professionals.

25.   One such dispute was settled by Marie with a verdict apparently asserting that true love can not exist between man and wife.

26.   Rather than the carpets, curtains and video, this refers to the quality of relationships which should exist between parents and children.

27.   Substantial areas of disagreement still exist between scientists.

28.   Such models receive information from both top-down and bottom-up sources, and feedback exists between all levels.

29.   The major failing with finite state grammars is their inability to deal with any dependencies that exist between non-adjacent words.