This hierarchy may lead to situations in which an older person addresses a younger person using a term usually used for older people, such as "ông trẻ" (literally "young grandfather"). This phenomenon is highlighted in a Vietnamese proverb: "Bé bằng củ khoai, cứ vai mà gọi" (Small as a potato, but call by rank). Singular kinship terms can be pluralized using the plural marker "các", as in "các anh". When speaking to an audience in a formal context, kinship terms are often strung together to cover common individual relationships: "các anh chị em" refers to an audience of roughly the same age, while "các ông bà anh chị em", sometimes abbreviated "ÔBACE", refers to an audience of all ages. In Vietnamese, virtually any noun used for a person can be used as a pronoun. These terms usually don't serve multiple roles like kinship terms (i.e. the term has only one grammatical person meaning). Words such as "doctor", "teacher", "owner", etc. can be used as a second-person personal pronoun when necessary. When referring to themselves, Vietnamese speakers, like speakers of Chinese, Japanese, and Korean languages, tend to deprecate their position while elevating the audience. While many of these terms are now obsolete, some remain in widespread usage. The most prominent of these words is "tôi", literally meaning "servant". It is used as a fairly neutral term for "I" (not very friendly, nor very formal). "Tớ", also meaning "servant", is also popular among young people to refer to themselves with close friends (used in conjunction with "cậu" for "lad"). Pronouns that elevate the audience still in use include "quý khách" (valued customer), "quý vị" (valued higher being). "Bạn" (friend) is also popular among young people to call each other. Vietnamese speakers also refer to themselves and others by name where it would be strange if used in English, eliminating the need for personal pronouns altogether. For example, consider the following conversation:  Directly translated into English, the conversation would run thus: A normal translation of the conversation into English would be: While always referring to oneself or the audience by name would be considered strange in English, in Vietnamese it is considered friendly and slightly respectful, especially between acquaintances of different sexes who are not very close (as to use even more familiar terms such as "tao", "mày"), or between young girls.