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    //================== Please DO NOT modify any code below ======================    public boolean equals(SynonymList list)    {        boolean retval = false;        int len = length();                SynonymNode StudentCodeNode = head;        SynonymNode TeacherCodeNode = list.head;		StudentCodeNode = head;		TeacherCodeNode = list.head;	    retval = true;	    	    while ((StudentCodeNode != null) && (retval == true))	    {	        retval = false;	        if (StudentCodeNode.equals(TeacherCodeNode))	        {	            retval = true;	            StudentCodeNode = StudentCodeNode.next;	            TeacherCodeNode = TeacherCodeNode.next;	        }	    }        if (retval != true){        	StudentCodeNode = head;        	TeacherCodeNode = list.head;            if (list != null){            	System.out.print("Expected: ");            	while (TeacherCodeNode != null){            		System.out.print(TeacherCodeNode.synonym + " ");            		TeacherCodeNode = TeacherCodeNode.next;             	}            	System.out.print("\nGot:      ");            	while (StudentCodeNode != null){            		System.out.print(StudentCodeNode.synonym + " ");            		StudentCodeNode = StudentCodeNode.next;            		}            	System.out.println("\n");            }        }        return retval;    }}