title: How to implement two dimensional arrays in tcl
body: <p>Need assistance in creating two dimensional arrays.</p>
  
  <p>I need to create the below scenario</p>
  
  <pre><code>nblist_0 = {1,2,3,4}
  nblist_1 = {3,7,5,9,1}
  nblist_2 = {7,4,9,2,5}
  nblist_3 = {1,2,4,6}
  nblist_4 = {1,5,4}
  ... 
  </code></pre>
  
  <p>Since my logic hereafter follows the above two dimensional array, I also need the logic to access the individual data (just like an array). Kindly help!!</p>