Sentence:  My memory has catalogued for easy reference and withdrawal the image of her pink , scented stationery and the unsloped , almost printed configurations of her neat , studious handwriting with which she invited me to recall our summer , so many <WSD>sentences</WSD> beginning with `` Remember when '' ; and others concerning camp friends who resided in her suburban neighborhood , and news of her commencing again her piano lessons , her private school , a visit to Boston to see her grandparents and an uncle who was a surgeon returned on furlough , wounded , from the war in Europe . 
Meaning of the word marked with <WSD> tags:  a string of words satisfying the grammatical rules of a language