while(firstIterator.hasNext()){
firstIterator.next();
secondIterator.next();
/** Compare position IntIterator*/
IntervalIterator firstIntervalIt = firstIterator.intervalIterator(firstIndex);
IntervalIterator secondIntervalIt = secondIterator.intervalIterator(secondIndex);
while(firstIntervalIt.hasNext()){
Interval firstIntv = firstIntervalIt.nextInterval();
Interval secondIntv = secondIntervalIt.nextInterval();
System.out.println("left:" + firstIntv.left + " " + "right:" + firstIntv.right);