Example sentences of "[conj] twice a [noun] for " in BNC.

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1 If there is no other system of air-conditioning , and the window can not be open all the time because of draughts or security , it should at least be opened once or twice a day for a spell .
2 In the other three cases where direct support was given , the client was not thought to need extra help ; the development officer felt however that the informal carer needed support and she therefore visited once or twice a week for that purpose .
3 Look at the habitat once or twice a week for several weeks .
4 The point remains that twice a day for twenty minutes in your own time and in the location of your choice you can refresh the parts that Dr Ruth can only fantasize about .
5 He suggests using a deep-conditioning treatment once a week for dry hair and twice a month for oily hair .
6 Communion comes but twice a year for some
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