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What is iron logic?

If you feel unconvinced, you can buy stocks on the same day as me and send them out on the same day, so that everyone can see for themselves whether they have risen or not, instead of deceiving everyone with your poor P-chart, or satisfying your pathetic vanity of losing money every day to find a sense of existence.Those who delete posts and pictures are liars, and they can't be faked only when they are posted on the same day, because anyone with eyes can see it if it goes up or not.What is iron logic?

What is the only certainty in countless changes?What is the only certainty in countless changes?