| http://www.w3.org/ns/prov#value | - The sheet switch 31 includes abstract graphic keys 34 having fourty-two kinds of abstract graphic segments such as ???, ???, and ?? as well as representational icon keys 35 having, for example, fourteen kinds of icons such as a cloud, wave, hand, foot and butterfly, which are printed respectively on the left- and right-side areas of a top surface of the sheet switch 31 coated with the transparent
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