title: Add new lines when concatenating strings?
body: <p>I have following sentences that I would like to combine together, but I want the second sentence to start out as a new paragraph:</p>
  
  <pre><code>Sentence 1: Premise: R is very useful for automating tasks at the office.
  Sentence 2: Conclusion: Therefore, we should learn R.
  </code></pre>
  
  <p>I would like the two sentences to look like the following:</p>
  
  <pre><code>Premise: R is very useful for automating tasks at the office.
  
  Conclusion: Therefore, we should learn R.
  </code></pre>
  
  <p>Here is what I have tried so far:</p>
  
  <pre><code>sen.1 &lt;- "Premise: R is very useful for automating tasks at the office."
  sen.2 &lt;- "Conclusion: Therefore, we should learn R."
  paragrah &lt;- cat(sen.1, sen.2)
  
  paragraph
  Premise: R is very useful for automating tasks at the office. Conclusion: Therefore, we should learn R.
  </code></pre>
  
  <p>Thanks in advance!</p>