An old puzzle says: “Their are three misteaks in this sentence” and asks you to find them. Answer: the third is that there are only two. Clever, but it contains a paradox. If the third error in the sentence is that it contains only two, not three mistakes, then “three” is actually correct, which means it contains only two mistakes, which means “three” is wrong, etc. -- https://frederic-38110.medium.com/the-magic-of-logic-15-46293bb3dfbf