</a>
<a class="sourceLine" id="cb2-7" data-line-number="7">n_objects &lt;-<span class="st"> </span><span class="kw"><a href="https://rdrr.io/r/base/length.html">length</a></span>(objects)</a>
<a class="sourceLine" id="cb2-8" data-line-number="8"></a>
<a class="sourceLine" id="cb2-9" data-line-number="9">attributes &lt;-<span class="st"> </span><span class="kw"><a href="https://rdrr.io/r/base/paste.html">paste0</a></span>(<span class="st">"P"</span>, <span class="dv">1</span><span class="op">:</span><span cl