title: Concatenate/Merge vectors in single vector in clojure
body: <p>My map function giving me output:</p>
  
  <pre><code>([[:db/retract 1 :a 23] [:db/retract 1 :b 34]] [[:db/retract 2 :v 45] [:db/retract 2 :o 89]] [[:db/retract 4 :l 6]])
  </code></pre>
  
  <p>But I want these like :</p>
  
  <pre><code>([[:db/retract 1 :a 23] [:db/retract 1 :b 34] [:db/retract 2 :v 45] [:db/retract 2 :o 89][:db/retract 4 :l 6]])
  </code></pre>
  
  <p>How we should merge the vectors in single vector? </p>