Example sentences of "and [noun pl] over a [noun] of " in BNC.

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1 Of course , one of the main difficulties in this kind of research lies in the collection of accurate information about events and experiences over a period of twenty years or more .
2 A programme of lectures , seminars and visits over a period of time is most likely to meet that need .
3 Will the attack on democracy be as outrageous as killing all blue-eyed babies , or will it be a more insidious erosion of rights and liberties over a period of time ?
4 There had been several copyings out and rewritings over a number of years , and although the changes made are sometimes evidence of ideological revisionism ( the poet had become more conformist in his later years ) , what is remarkable is how much of the young man 's vision has been allowed to remain intact .
5 One crucial communicating network would link the individual schools promoting particular languages in which there has been continuity in terms of staffing and tutor-groups over a number of years .
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