lass="dv">0</span>)))</span>
<span id="cb35-8"><a href="a-stairway-to-heaven.html#cb35-8"></a>t_upset &lt;-<span class="st"> </span><span class="kw">t</span>(<span class="kw">apply</span>(upset, <span class="dv">1</span>, cumsum))</span>
<span id="cb35-9"><a href="a-stairway-to-heaven.html#cb35-9"></a></span>
<span id="cb35-10"><a href="a-stairway-to-heaven.html#cb35-10"></a>t_stairs &lt;-<span class="st"> </span>stairs <span class="op">+</span><span class="st"> </span>t_upset</span>
<span id="cb35-11"><a h