private String inverseLetters(String str){
		String returnValue = new String(), c = new String();
		if(str.length()>0){
			for(int i=0;i<str.length();i++){
				c = str.substring(i,i+1);
				if(c.equalsIgnoreCase("A")){
					returnValue+="T";
				}//END IF
				if(c.equalsIgnoreCase("T")){
					returnValue+="A";
				}//END IF
				if(c.equalsIgnoreCase("C")){
					returnValue+="G";
				}//END IF
				if(c.equalsIgnoreCase("G")){
					returnValue+="C";
				}//END IF
			}//END FOR
		}//END IF
		return this.inverseLettersOrder(returnValue); 
	}//END FUNCTION