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i> ? he comes to see us once a week ; she'll be back in a week ; five-day week ;
a two-week vacation / ;
week in, week outb> , ; every Saturday, week in, week out, she goes to her parents for lunch / , ; today weekb>, .i> a week (from) todayb> ; ; tomorrow weekb> .i> a week (from) tomorrowb> ; ; a week yesterdayb> ; ; a week last Mondayb> ; .