| http://www.w3.org/ns/prov#value | - For example, while keys near one corner of housing 1, e.g. 2C and 2D, are operated, a key opposite to keys 2C and 2D along the diagonal line of the face of housing 1 on which operating part 2 is provided, e.g. 2F, or a key opposite to keys 2C and 2D along the longitudinal direction of housing 1, e.g. 2B, is operated.
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