A step structure for a saddle-ride vehicle includes a step that is turned in a freely derricking manner between a usage state raised in a vehicle width direction and a storage state falling along a lateral side of a vehicle. The authentication processing unit 197 performs again the authentication process with the communication device 200 using the new authentication key generated by the update key generating unit 160. The logic operating unit receives a power pulse signal generated by a power button when the power button is pressed. At least one of the acrylate-type monomers and norbornene-type monomers of the polymer embodiments of the present invention encompass an acid labile moiety. An indication of the determined related artifacts is displayed to a user as impact analysis results. An aliquot of the alkylated effluent is then recycled to the one at least one alkylation reaction zone such that the molar ratio of alkylatable aromatic compounds to said alkylating agent in the combined refinery gasoline and recycle streams introduced into the at least one alkylation reaction zone is at least 1.