Can I get some help on this question with answer and detailed explanation?

Dynamic Games For the following game: (1) write the game in Normal form (1.5 points); (2) count how many subgames there are; (.5pt) (3) find one Subgame Per- fect Equilibrium. (HINT: First, find the equilibria of the subgames at the bottom of the game tree. Then solve for the optimal choice of player 1 be- tween X and Y). Y 2 u d U U u d 3,2 1, 2 0, 1 1,3 0, 2 2, -1 1, 1 3, -2