Example sentences of "[be] performed [prep] a time " in BNC.

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1 However , in order to be used successfully , pointing must be carefully co-ordinated with the child 's vocalisations and her direction of gaze and be performed at a time when the adult is attending to the child ( Lock 1980a ) .
2 Only one type of operation may be performed at a time .
3 For each package , the user can either ACCEPT or REJECT the SSR , however only one type of operation can be performed at a time .
4 Design services will also be performed on a time and materials basis by STB engineering consultants .
5 Design services will also be performed on a time and materials basis by Sparc Technology engineering consultants .
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