title: Remove space between the words from 5th column
body: <p>I have data</p>
  <pre><code>cell   input     out    type      fun            level
  AI20   A1,A2      Z     comb    ((A1 A2))            2
  IA2    A1,A2,A3   Z     comb    ((!A1 A2) A3)        3
  XOR    A1,A2,B1   Z     comb    (((A1 A2) B1)        3
  IAD    A1,A2,A3   Z     comb    (!((A1 A2) A3))      3
  INV    I1         ZN    comb    (!I1)                1  
  BUF  A1,A2,A3,B1  Z     comb    (!(((A1A2) A3) B1))  4
  </code></pre>
  <p>How can I remove space between the words from field 5 i.e fun column
  , so that when I do <code>column -t</code> they are perfectly aligned.</p>
  <p>I tried to used</p>
  <pre><code>sed -r 's/[[:blank:]]+//5'
  </code></pre>
  <p>But this removes only the 1st space between words in 5th column.</p>