Generally speaking, the present invention is a water-soluble copolymer film comprising a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, of from about 90% to 100%. A record including multiple encrypted blocks is received. This invention also provides an automatic operation method for the automatic knowledge management system. The nitrous oxide and the fuel are feed to conduits exiting the module with the nitrous oxide conduit being inside of the fuel conduit. A power supply receives the low voltage output and produces a higher voltage for low-wattage light sources installed in the cabinet.