A stain remover which comprises a copolymer made from as essential ingredients a polymerizable monomer having a polyfluoroalkyl group with less than 8 carbon atoms and represented by the general formula H2C\u2550CXCOO\u2014Y\u2014Rf and a fluorine-free polymerizable monomer represented by the following general formula: H2C\u2550CXCOO\u2014n\u2014X. First, an optimizer performs a first optimization of the plan to generate dose distributions corresponding to the plan. An operating system of the user computer systems operate to set up a registry. without discharging unreacted ammonia through oxidation reaction. The silhouette may also be characterized by its first syllable blends.