title: Create a fully connected graph
body: <p>How is it possible to create a fully undirected graph with 5 nodes?</p>
  
  <p>Using the igraphe package for exampple</p>
  
  <pre><code>library(igraph)
  nodes &lt;- c("A", "B", "C", "D", "E")    
  </code></pre>