| http://www.w3.org/ns/prov#value | - Further, if a plurality kind of units such as a light bulb, a stroboscope unit, a projector unit and a back light unit are prepared in advance and a kind of unit which is arranged on the display support portion 4901 is properly selected depending on measurements such as measurement which provides a simple light stimulation such as light flashing and measurement which provides complex light stimula
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