A perfect pangram contains every letter of the alphabet only once and can be considered an anagram of the alphabet. The only perfect pangrams of the English alphabet that are known either use abbreviations or other non-words, such as "Mr Jock, TV quiz PhD, bags few lynx" or "Quickly Nez Ford, what's JPG BMX V?", others use words so obscure that the phrase is hard to understand, such as "Cwm fjord bank glyphs vext quiz", in which "" is a loan word from the Welsh language meaning a steep-sided glaciated valley, and "vext" is an uncommon way to spell "vexed". Other writing systems may present more options; the Iroha is a well-known perfect pangram of the Japanese syllabary.