pan><span class="va">d</span>, <span class="va">d2</span><span class="op">)</span> <span class="co"># same as d + d2</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> |1, 2, s = "a", v = (1L 2L 3L), 0, 1|</span>
<span class="r-in"><span><span class="va">d2</span> <span class="op">+</span> <span class="va">d</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> |0, 1, 1, 2, s = "a", v = (1L 2L 3L)|</span>
<span class="r-in"><span><span class="va">d</span> <span