import java.util.Map; import java.util.TreeMap; public class Maps {    /**       Returns a new map with common key-value pairs.       @param map1 the first map to compare       @param map2 the second map to compare       @return a map containing entries common to both maps    */    public static Map getCommon(Map map1,          Map map2)    {       Map common = new TreeMap<>();       /*  code goes here */       return common

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