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The rules for naming diynes are as follows: The base part of the name is derived from the number of carbon atoms in the parent chain. The suffix -diyne is added to the base name. The location of the triple bonds is indicated by numbers. The lower number is placed before the syllable locat and the higher number before the syllable -yne. If the triple bonds are separated by more than one single bond, the number of intervening single bonds is indicated by the Greek letter, delta (D).