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ClusterMarker is a marker manager for use with maps powered by the Google Maps API.
ClusterMarker detects any group(s) of two or more markers whose icons visually intersect when displayed. Each group of intersecting markers is then replaced with a single cluster marker. The cluster marker, when clicked, simply centers and zooms the map in on the markers whose icons intersect. Alternatively you can write your own function to be executed when a cluster marker is clicked.