| http://www.w3.org/ns/prov#value | - People in the modern society often obtain much information by viewing various kinds of matter (It is possible, for example, to obtain much useful information by viewing a subway map, a sign, various kinds of web pages existing on the internet, recognize that a tomato is ripe by viewing the color of the tomato, and check doneness of broiled meat by viewing it.) and soothe their heart (For example,
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