title: Add new column with times same value was found in 2 columns
body: <p>Add new column with value of how many times the values in columns 1 and 2 contends exactly same value.</p>
  
  <p><strong>input file</strong></p>
  
  <pre><code>46849,39785,2,012,023,351912.29,2527104.70,174.31
  46849,39785,2,012,028,351912.45,2527118.70,174.30
  46849,39785,3,06,018,351912.12,2527119.51,174.33
  46849,39785,3,06,020,351911.80,2527105.83,174.40
  46849,39797,2,012,023,352062.45,2527118.50,173.99
  46849,39797,2,012,028,352062.51,2527105.51,174.04
  46849,39797,3,06,020,352063.29,2527116.71,174.13,
  46849,39809,2,012,023,352211.63,2527104.81,173.74
  46849,39809,2,012,028,352211.21,2527117.94,173.69
  46849,39803,2,012,023,352211.63,2527104.81,173.74
  46849,39803,2,012,028,352211.21,2527117.94,173.69
  46849,39801,2,012,023,352211.63,2527104.81,173.74
  </code></pre>
  
  <p><strong>Expected output file:</strong></p>
  
  <pre><code>4,46849,39785,2,012,023,351912.29,2527104.70,174.31
  4,46849,39785,2,012,028,351912.45,2527118.70,174.30
  4,46849,39785,3,06,018,351912.12,2527119.51,174.33
  4,46849,39785,3,06,020,351911.80,2527105.83,174.40
  3,46849,39797,2,012,023,352062.45,2527118.50,173.99
  3,46849,39797,2,012,028,352062.51,2527105.51,174.04
  3,46849,39797,3,06,020,352063.29,2527116.71,174.13,
  2,46849,39809,2,012,023,352211.63,2527104.81,173.74
  2,46849,39809,2,012,028,352211.21,2527117.94,173.69
  2,46849,39803,2,012,023,352211.63,2527104.81,173.74
  1,46849,39803,2,012,028,352211.21,2527117.94,173.69
  1,46849,39801,2,012,023,352211.63,2527104.81,173.74
  </code></pre>
  
  <p><strong>attempt:</strong></p>
  
  <pre><code>awk -F, '{x[$1 $2]++}END{ for(i in x) {print i,x[i]}}' file
  
  4684939785 4
  4684939797 3
  4684939801 1
  4684939803 2
  4684939809 2
  </code></pre>