Please help.

The normalform game below represents the stage game of a threeperiod repeated game. First, determine the purestrategy stage Nash equilibria in this game. Sec ond, determine whether the following strategy prole constitutes a SPNE: play (A,B) in the rst period, (B,A) in the second period, and (B,B) in the third period, but if either player deviates in the rst period, play (B,B) in the second and third periods. Player 2 A B PM,\" A B (611)