7.1. Suppose that you have a stopping time 7 in the 4-period binomial model such that the following is true about 7: T(HHTT) = 00; T(TTHH) = 2; T(HTHT) = 2 For each other state, give all of the possible values that 7 could have. You do not need to list each state indivudually; for example it is possible to describe what happens in all states of the form (H, H, w3, w4) in one go