The present invention provides a composition that is suitable for lowering the alkalinity of a textile. This roller skate has a shoe and a wheel supporting frame extending therefrom said shoe for supporting aligned wheels. The sapphire substrate is heated and etching gas is injected into the MOCVD reactor. This decoder can be memory row-oriented, and thus provide an asynchronously-resettable row decoder with row redundancy, or an asynchronously-resettable column decoder with column redundancy. Classifiers can be based on known distance or correlation measures. A sensor having a sensing element may extend through the sensor lumen and be positioned internal to the patient for physiological parameter sensing.