This invention relates to a process for producing 5-methyl-1-R-2-pyrrolidone or 5-methyl-2-pyrrolidone, wherein R is a hydrocarbyl or substituted hydrocarbyl, by reductive amination of levulinic acid utilizing a metal catalyst, which may be optionally supported. The first unit includes a negative first sub-unit not moving for focusing, and a positive second sub-unit and a positive third sub-unit moving toward image side and object side, respectively, when focusing from infinity object to proximity object. The self-adhesive cleaning wipe is removable and disposable in order to facilitate infection control. The engine control unit receives the output signal to output a control signal for controlling a key lockrelease and a steering wheel lockrelease. The operating system may send this signal to indicate it is about to commence evicting pages from the memory or when it has commenced swapping out application data. The shaft extends into the gear housing and the worm is meshed with the worm gear.