title: Is there an R function to split the sentence
body: <p>I have couple of unstructured sentences like below. Description below is column name</p>
  
  <pre><code>Description
  
  Automatic lever for a machine
  Vaccum chamber with additional spare
  Glove box for R&amp;D
  The Mini Guage 5 sets
  Vacuum chamber only
  Automatic lever only
  </code></pre>
  
  <p>I want to split this sentence from Col1 to Col5 and count there occurrence like below</p>
  
  <pre><code>Col1             Col2            Col3               Col4               
  Automatic_lever lever_for        for_a               a_machine  
  Vaccum_chamber  chamber_with     with_additional    additional_spare     
  Glove_box       box_for          for_R&amp;D            R&amp;D 
  The_Mini        Mini_Guage       Guage_5             5_sets 
  Vacuum_chamber  chamber_only     only       
  Automatic_lever lever_only       only       
  </code></pre>
  
  <p>Also from above columns, can i have the occurence of these words. Like, Vaccum_chamber and Automatic_lever are repeated twice here. Similarly, the occurence of other words?</p>