| http://www.w3.org/ns/prov#value | - Thus, a more realistic video game can be provided. [0085] The shape of the circular portion 4011 which is the planar portion of the 3D water-drop model 401 is not limited to the circular shape, but may be an elliptical shape having a dimension ???a??? and a horizontal dimension ???b??? different from each other, a track shape including straight lines on its outer periphery, a gourd shape, or like
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