Example sentences of "do it [adv] a [noun sg] " in BNC.

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1 Well we only do it twice a week .
2 And that 's another reason we only do it twice a week .
3 They only do it once a year on the flat .
4 There are women who live with their husbands and they hate their husbands and do it once a month so their Amex cards do n't get cancelled .
5 I think they do it once a month perhaps .
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