{HEAD ~ The compounds} which constitute {TAIL ~ this invention} and their methods of preparation will appear more fully from a consideration of the following examples which are given for the purpose of illustration only and are not to be construed as limiting the invention in sphere or scope 
constitute
{ HEAD ~ The compounds } which constitute { TAIL ~ this invention } and their methods of preparation will appear more fully from a consideration of the following examples which are given for the purpose of illustration only and are not to be construed as limiting the invention in sphere or scope
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