| http://www.w3.org/ns/prov#value | - block diagram of a transaction server; FIGS. 12A-12B are a flow chart of a customer process in the product offering for group buying according to the invention; FIGS. 13A-13E are a flow chart of a system process in the product offering for group buying according to the invention; FIG. 14 is a block diagram of an exemplary system 1400 for determining a customer history factor from various input var
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