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Thanks for your answer. One thing i'm confused with is args.callee. I'm not sure why it can call callFunction in Flashloan contract when args.callee is the address of DyDxFlashLoan contract.
Thanks. From another answer than your own, what if I send all tokens to Claim contract as a creator of MyToken and fix claimWinning() like token.transfer(msg.sender, 100000);? This way I don't need to use automated airdrop and still keep the token ecosystem?