Sentence:  The Commission shall complete its affairs in connection with settlement of United States-Yugoslav claims arising under the Yugoslav Claims Agreement of 1948 <WSD>not</WSD> later than December 31 , 1954 : Provided , That nothing in this provision shall be construed to limit the life of the Commission , or its authority to act on future agreements which may be effected under the provisions of this legislation . 
Meaning of the word marked with <WSD> tags:  negation of a word or group of words