//convert a Set<String> into a quoted, comma separated String literal for inclusion in a dynamic SOQL Query
    private static String quoteKeySet(Set<String> mapKeySet)
    {
        String newSetStr = '' ;
        for(String str : mapKeySet)
            newSetStr += '\'' + str + '\',';

        newSetStr = newSetStr.lastIndexOf(',') > 0 ? '(' + newSetStr.substring(0,newSetStr.lastIndexOf(',')) + ')' : newSetStr ;
        System.debug('quoteKeySet() :  newSetStr ============ ' + newSetStr);

        return newSetStr;

    }