There is a ship coming here. So, I here I give a disturbance, large disturbance I gave. You know ship, let us say I give a push. Now, what happen then of course, I give a push and left my hand just like our roll know, I just rolled it to a 5 degree and left my hand. What would happen, there are various possibility the ship can actually no no no rudder. Remember there is no rudder, it can actually then take a straight line course. It can also go halyard halyard. I do not have this; I mean this is one of the behaviors that are possible. If a ship behaves that way, we call this this this particular property, the studying these properties known as straight line stability.