The wiring board 16, wherein the via plug fills an entirety of the through opening such that side surfaces of the via plug directly abut the insulating layer, and the via plug directly connects to {HEAD ~ the back surface} of {TAIL ~ the first electrode} 
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The wiring board 16 , wherein the via plug fills an entirety of the through opening such that side surfaces of the via plug directly abut the insulating layer , and the via plug directly connects to { HEAD ~ the back surface } of { TAIL ~ the first electrode }
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