public void findChanges(){
		changes = new ArrayList<Integer>();
		if(unmodifiedSequence != null && modifiedSequence != null){
			
			for(int i = 0; (i < unmodifiedSequence.length() && i < modifiedSequence.length()); i++){
				if(unmodifiedSequence.charAt(i) != modifiedSequence.charAt(i)){
					this.changes.add(i);
				}
			}
		}
		
	}