ord mathit">b</span></span></span></span></eq> with <eq><span class="katex"><span class="katex-mathml"><math><semantics><mrow><msup><mi>a</mi><mo>∗</mo></msup></mrow><annotation encoding="application/x-tex">a^*</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="strut" style="height:0.688696em;"></span><span class="strut bottom" style="height:0.688696em;vertical-align:0em;"></span><span class="base textstyle uncramped"><span class="mord"><span class="mord mathit"