lass='fu'>binomial_heap</span>()
 <span class='no'>b_heap</span> <span class='kw'>&lt;-</span> <span class='fu'>insert</span>(<span class='no'>b_heap</span>, <span class='no'>letters</span>[<span class='fu'><a href='https://rdrr.io/r/base/seq.html'>seq</a></span>(<span class='fl'>3</span>)], <span class='fu'><a href='https://rdrr.io/r/base/list.html'>list</a></span>(<span class='fl'>1</span>, <span class='fu'><a href='https://rdrr.io/r/base/diag.html'>diag</a></span>(<span class='fl'>3</span>), <span class=