There are usually two usages of a word. One is to use the word to express the object of common celebration. One is to use the word to express itself. Among them, the former usage usually expresses the meaning of the word. It is a referential usage; the latter usage usually expresses the form of the word, which is generally called self-named usage. According to the above definitions, which of the following black words are self-naming? ['Women generally prefer pink.', 'Elephants generally live in the jungle.', '"Other", now generally used "Other".', '"Commodity" refers to labor products that are exchanged.']