| http://www.w3.org/ns/prov#value | - FIG. 3A is a side view, FIG. 3B is a schematic view taken along the direction of arrow A in FIG. 3A, FIG. 4A is a side view, and FIG. 4B is a schematic view taken along the direction of arrow A in FIG. 4A. In FIGS. 3A, 3B, 4A and 4B, the same elements as those shown in FIG. 1 are given the same reference characters.
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