John owes some money to Elaine that she will repay in two installments: 500 at time 3 and 700 at time 6. John is also owed some money by Catherine that will be payed back in two installments; X at time 2 and Y at time 5. The current yield curve is a flat 0.04, at which the present values and durations of these two cash flows are the same. Find X and Y , and determine whether or not the cash flow structure is Redington immunized.