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The extent of the search which must be made will depend upon the circumstances of the case including, in particular, the factors referred to in rule 31.7(2). The parties should bear in mind the overriding principle of proportionality (see rule 1.1(2)(c)). It may, for example, be reasonable to decide not to search for documents coming into existence before some particular date, or to limit the search to documents in some particular place or places, or to documents falling into particular categories.