A method and computer program product for partitioning the columns of a matrix A. Some of the systems andor methods are configured to receive sensitive data from a vendor, determine a token key for the vendor, and utilize a proprietary algorithm, based on the token key to generate a vendor-specific token that is associated with the sensitive data. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements. Most preferably, the copolymer is poly, and polyethylene glycol is the crystallizable side chain. The electrophotographic photoreceptor has excellent stability of electrical properties and interlayer adhesion strength, by including the undercoat layer. Each of the light transmitting sections is adapted to allow the light emitted from the light emitter to pass through.