PURPOSE: the component by the different charges of charging according to admission ticket is provided to using the price that the redundancy link method of internet constructs justice. ;CONSTITUTION: teacher seeks to open room (S210). Redundancy connection, which is subscribed to, is shown in website (S230). Student information is entered by student member (S240). If a people is selected, contact number teacher component and component information charge to (S250). ;The 2011 of copyright KIPO submissions
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