margin-right:0.2777777777777778em;"></span></span><span class="base"><span class="strut" style="height:2.61953em;vertical-align:-1.13453em;"></span><span class="mord"><span class="mopen nulldelimiter"></span><span class="mfrac"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:1.4849999999999999em;"><span style="top:-2.301288em;"><span class="pstrut" style="height:3em;"></span><span class="mord"><span class="mop"><span class="mop op-symbol small-op" style="position:relat