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in the previous video we learned how to send tokens on behalf of the order by using approve and transfer from in this video I want to take a step further and show you how you can use those functions to build a contract that can trade one year C 20 for another lets say that Alice has 100 Alice coin and Bob has 100 Bob coin and they want to exchange ten Alice coins for 20 Ball coins so that after the trade Alice will have 90 Alice coin and Bob you have ten Alice will also have twenty popcorn and Bob will have eighty lets see how we can accomplish this we all start by considering what to go wrong when Alice directly sends ten of our tokens to Bob so Alice transfers ten of our tokens to Bob Ellis now has 90 Alice coin and Bob as ten Bob sees that he received his ten tokens if Bob is a dishonest person then he has no incentive to complete the trade by transferring twenty of Bob coin to Alice he decides to no longer cooperate with Alice and leaves the trade Alice is left with