title: How to find the union of two lists in tcl?
body: <p>I'm familiar with finding the intersection of two lists, however, I wanted to find the union of two lists in tcl (while eliminating duplicates). I do have a working copy of this code, but I'm not sure it is robust enough for any kind/number of lists and am hence looking for a better solution.</p>
  
  <p>Any help or ideas are appreciated.</p>