title: Fill in rows missing row labels for repeated values
body: <p>I have the following input:</p>
  
  <pre><code>printf "Name\tArea\tNumber\tA\tB\tC\n\t\t\tA\tB\tC\n\t\t\tA\tB\tC\n"
  Name    Area    Number  A       B       C
                          A       B       C
                          A       B       C
  </code></pre>
  
  <p>If first 3 columns are blank, 
  I want to print the previous 3 columns along with the data of the new line, 
  else print the line as is. Output should look like this:</p>
  
  <pre><code>printf "Name\tArea\tNumber\tA\tB\tC\nName\tArea\tNumber\tA\tB\tC\nName\tArea\tNumber\tA\tB\tC\n"
  Name    Area    Number  A       B       C
  Name    Area    Number  A       B       C
  Name    Area    Number  A       B       C
  </code></pre>