Example sentences of "build [adv] [prep] [art] period [prep] " in BNC.

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1 Another proof is taken and so the print is built up over a period of time .
2 Strong and sometimes quite intense relationships with individuals are built up over a period of even a few weeks .
3 Clearly memories are not formed instantaneously , as if by throwing a switch , but are built up over a period of hours after the event to be memorized has occurred ; during this build-up the form in which any memory is stored changes .
4 In fact there was a , I think some of the recent erm concerns about schools have come from an image that 's been built up over a period of time that the schools spend very little time on the , on the three Rs for example .
5 Even so , considerable errors can build up over the period of ten or more years that elapses between one Census date and the time when the finalized results of the next Census can be used .
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