A text processing method is provided that includes the following steps. By disengaging the wire cassette and drive mechanism cassette, an operator has much greater control of the unit since the wire loaded wire cassette is fixed and the operator need only maneuver the lightweight drive mechanism cassette. The composition for flame-retardant flexible polyurethane foam of the present invention can give a flexible polyurethane foam that has satisfactory flame retardant properties, as well as excellent properties such as better heat resistance, fogging resistance and scorch resistance and extremely low compression strain. The scanning results may be sent, for example, by the first node, to the one or more other nodes.