The invention provides a high throughput, high purity, high yield system and method of isolating and purifying rebaudioside A, with acceptable water solubility for all commercial uses, from commercially available Stevia rebaudiana starting material. A calculation unit of the numerical expression to be edited is indicated by a cursor and a corresponding display block of the rough map is displayed emphatically in the rough map ). A disclosed bondable blood-friendly polymer coating not only can overcome these defects, but also can improve the blending property thereof. If a predetermined event occurs, the processing of the computer-executable instructions results in a window having the predefined content to be displayed over the document. The base computer unit is enclosed by a housing and comprises a data processor, a data storage device, and a remote communication interface device.