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The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...
An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. [1] For example, the word anagram itself can be rearranged into the phrase "nag a ram". The original word or phrase is known as the subject of the anagram. Any word or phrase that exactly ...
The longest English word typable using only the top row of letters has 11 letters: rupturewort. The word teetertotter (used in North American English) is longer at 12 letters, although it is usually spelled with a hyphen. The longest using only the middle row is shakalshas (10 letters). Nine-letter words include flagfalls; eight-letter words ...
The letter u can take a diaeresis (ü), but only after the letter g; Some words frequently used: de, el, del, los, la(s), uno(s), una(s), y; No apostrophised contractions; No use of grave accent; Letters k and w are rare and only used in loanwords (e.g. walkman) Word beginnings: ll- (check not Welsh or Catalan) double L (ll)
A language may represent a given phoneme by combinations of letters rather than just a single letter. Two-letter combinations are called digraphs, and three-letter groups are called trigraphs. German uses the tetragraphs (four letters) "tsch" for the phoneme German pronunciation: and (in a few borrowed words) "dsch" for [dʒ]. [87]
The letters Q, X and Z are absent since these letters are very rare and only occur in foreign words. These letters and the foreign letters "Ä", "Ö" and "Ü", which are used in a few Norwegian words, can be played with a blank. C and W also occur only in foreign words, but they are not so rare, [35] so they were included.
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Historically, upper-case letters were used for representing points in geometry, and lower-case letters were used for variables and constants. Letters are used for representing many other sorts of mathematical objects. As the number of these sorts has remarkably increased in modern mathematics, the Greek alphabet and some Hebrew letters are