title: multicolumn csv text into presence absence matri
body: <p>I have a csv file like this:</p>
  
  <pre><code>    col1    col2    col3
  r1  a,b,c   e,f      g
  r2  h,i             j,k
  r3  l      m,n,o
  </code></pre>
  
  <p>some cells have multiple text comma separated, some have single and some have none.I want to convert this like:</p>
  
  <pre><code>   col1  col2  col3
  a   1     0     0
  b   1     0     0
  c   1     0     0
  e   0     1     0
  f   0     1     0
  g   0     0     1
  h   1     0     0
  i   1     0     0
  j   0     0     1
  k   0     0     1
  l   1     0     0
  m   0     1     0
  n   0     1     0
  o   0     1     0
  </code></pre>
  
  <p>Any suggestion? I tried pivot table in excel but not getting the desired output.
  Thanks in advance.</p>
  
  <p>Best Regards
  Zillur</p>