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The books are specially designed for students of GCE AS level , but the texts and exercises may be used at higher or lower levels , depending on the ability of the learner . The women were divided into two groups : Women in the study group were offered annual mammography screenings beginning at age 40 , while those in the control group were offered annual screenings beginning at age 50 . The exceptions are CHOLSKY and TOMCATV , where over a third of the prefetched references are not found in the cache . The antidepressants are n't working and the doctor prescribes another one : it must be the fourth or fifth we have tried . The floors are swept not vacuumed and washed about twice a year .