title: Grouping markers near together with the same cluster size by google map
body: <p>I want to group all markers near together with <strong>the same cluster size</strong> using google map.</p>
  
  <p>I tried MarkerClusterer supported by Google Map, but the cluster size are different.</p>
  
  <p>Is there any example for me? </p>
  
  <p>Thanks for your help.</p>