;-<span class="st"> </span><span class="kw">replicate</span>(stair_blocks, pos)</span>
<span id="cb35-7"><a href="a-stairway-to-heaven.html#cb35-7"></a>upset &lt;-<span class="st"> </span><span class="kw">cbind</span>(<span class="kw">rep</span>(<span class="dv">0</span>, <span class="dv">3</span>), <span class="kw">replicate</span>(stair_blocks <span class="op">-</span><span class="st"> </span><span class="dv">1</span>, <span class="kw">c</span>(<span class="dv">1</span>, <span class="dv">1</span>, <span c