A local radio station makes the following announcement: We play five songs in a row. Always. If we don't, we will pay you $50,000. Every day you listen to only that radio station and on June 15, you catch them playing three songs followed by a commercial, then two songs. You immediately call the radio station to claim the $50,000. The radio station refuses to pay you the money. Did the radio contract make a valid contract with you? Why or why not? If so, would it be a bilateral or unilateral contract?