code: public boolean belongsToCoexistenceGroup(Interval interval){
  		return interval.getStart() >= minBorders.getStart() &&
  			   interval.getStart() < minBorders.getEnd();
  	}
docs: Checks if the given interval belongs to the coexistence group which consists of all list intervals.<br>
  This is only the case when it starts within the minimum borders.<br>
  If the minimum borders are a and b, the start time of the given interval has to lie in [a;b).
  @param interval The interval to check.
  @return <code>true</code> if the given interval belongs to the same coexistence group;<br>
  <code>false</code> otherwise.