English, much like other Germanic languages, has a particularly large number of vowel phonemes, and in addition the vowels of English differ considerably between dialects. Because of this, corresponding vowels may be transcribed with various symbols depending on the dialect under consideration. When considering English as a whole, lexical sets are often used, each named by a word containing the vowel or vowels in question. For example, the set consists of words which, like "lot", have in Received Pronunciation and in General American. The " vowel" then refers to the vowel that appears in those words in whichever dialect is being considered, or (at a greater level of abstraction) to a diaphoneme, which represents this interdialectal correspondence. A commonly used system of lexical sets, devised by John C. Wells, is presented below; for each set, the corresponding phonemes are given for RP and General American, using the notation that will be used on this page.