span></span>
<span class="r-in"><span><span class="va">d1</span> <span class="op">-</span> <span class="va">d2</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> |1|</span>
<span class="r-in"><span><span class="va">d2</span> <span class="op">-</span> <span class="va">d1</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> |2|</span>
<span class="r-in"><span><span class="va">d1</span> <span class="op">-</span> <span class="va">d1</span></span></span>
<span clas