an></span></span></span><span class="mrel mtight" style="">∈</span><span class="mord mtight" style=""><span class="mord mathcal mtight coloredeq eqj" style="">A</span></span></span></span></span><span style="top:-3.0500049999999996em;"><span class="pstrut" style="height:3.05em;"></span><span><span class="mop op-symbol large-op" style="">∑</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:1.321706em;"><span></span></span></span></spa