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...introduction, it is convenient to use the two-sign notation, but allow the sign <math>{}^{\backprime\backprime} \rightarrow {}^{\prime\prime}</math> to den The conditional sign <math>{}^{\backprime\backprime} \rightarrow {}^{\prime\prime}</math> denote

...rrel-hoop signifies wine in the tavern. But I am not talking here about a sign in so general a way. ...understanding the word 'sign' in this way, an utterance is not the natural sign of anything.