The reference is "A Course in Game Theory" by Osborne and Rubinstein and what I'm trying to figure out is what is Player 1's strategy set. The dashed lines represent incomplete information, that is, Player 1 doesn't know what Player 2 chose at the node above. I believe there should be 8 strategies but I'm having trouble setting them up. I was thinking something like {(L,L'},L''} would be one but I'm not sure if that's correct.

L R 2 2 B Rb La Ra Lb 1 1 1 1 - D E C L' R' L' R' L" R" L" O (20)00/L