The continuously compounded risk-free interest rate is 0.06. S_y stock pays no dividends and is priced at $50. S_x stock is priced at $45 and has quarterly dividends of $2, with the next dividend payable in 3 months. Suppose, M is the premium of an option to give S_x and receive S_y at the end of 9 months. Also, suppose that N is the premium of an option to give S_y and receive S_x at the end of 9 months. What is M N ? Show all your work and any associated formulas that were used.