def content    =
            """
            The Java Collections API is the basis   for   all the nice support that Groovy gives you
            through lists and maps. In fact, Groovy not only uses the same abstractions, it
            even works on the very same classes that make up the Java Collections API.
            """
            def words  =  content.tokenize()
            def wordFrequency  =  [:]
            words.each {
            wordFrequency[it]  =  wordFrequency.get(it,  0 )  +   1
            }
            def wordList  =  wordFrequency.keySet().toList()
            wordList.sort {wordFrequency[it]}
            def result  =   '
            wordList[ - 1 .. - 6 ].each {
            result  +=  it.padLeft( 12 )  +   " :  "   +  wordFrequency[it]  +   "  \n  "
            }
            println result
            

             the: 5
            Groovy: 2
            that: 2
            Collections: 2
            Java: 2
            same: 2