I would appreciate your help on the following probability question:

One chip is drawn at random from an urn that contains one white chip and one black chip. If the white chip is selected, we simply return it to the urn; if the black chip is drawn, that chip - together with another black - are returned to the urn. Then a second chip is drawn, with the same rules for returning it to the urn. Calculate the probability of drawing two whites followed by three blacks.

I think I am getting confused by the sequence of events. Does this problem mean that they want me to find the P(WWBBB) after two initial draws? How do I proceed, if that is the case, having four initial outcomes? Or maybe I am totally misunderstanding it.