title: find most occuring combined words
body: <p>I am trying to get text analysis done for a set of a set of short descriptions:</p>
  
  <pre><code>Short description
  Login failed for user
  login failed
  Authentication for login failed
  server unavailable ping failure
  Server unavailable
  server not starting
  </code></pre>
  
  <p>and im trying to find the maxiumum occured issue.
  I am applying the below
  after creating the appropriate corpus,</p>
  
  <pre><code>dataset = as.data.frame(as.matrix(dtm))
  dataset$Liked = sdr$Liked
  dataset = as.matrix(dtm)
  v = sort(colSums(dataset),decreasing=TRUE)
  myNames = names(v)
  d = data.frame(word=myNames,freq=v)
  </code></pre>
  
  <p>The output here gives me a single word count frequency.
  I want to find the occurences where the words came together.
  My expected output is </p>
  
  <pre><code>login failed         2
  server unavailable   2
  </code></pre>
  
  <p>Is this possible?</p>