. . . "The term ???alkenediyl??? when used without the ???substituted??? modifier refers to a non-aromatic divalent group, wherein the alkenediyl group is attached with two ??-bonds, with two carbon atoms as points of attachment, a linear or branched, cyclo, cyclic or acyclic structure, at least one nonaromatic carbon-carbon double bond, no carbon-carbon triple bonds, and no atoms other than carbon and h" . .