Either a thing has properties that nothing else has, in which case we can immediately use a description to distinguish it from the others and refer t… - Ludwig Wittgenstein

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Either a thing has properties that nothing else has, in which case we can immediately use a description to distinguish it from the others and refer to it; or, on the other hand, there are several things that have the whole set of their properties in common, in which case it is quite impossible to indicate one of them. For if there is nothing to distinguish a thing, I cannot distinguish it, since otherwise it would be distinguished after all.