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A trigraph (from the Greek: τρεῖς, treîs, "three" and γράφω, gráphō, "write") is a group of three letters used to represent a single sound or a combination of sounds that does not correspond to the written letters combined. For example, in the word schilling, the trigraph sch represents the voiceless postalveolar fricative /ʃ/, rather than the consonant cluster */skh/. In the word beautiful, the sequence eau is pronounced /juː/, and in the French word château it is pronounced /o/. It is sometimes difficult to determine whether a sequence of letters in English is a trigraph, because of the complicating role of silent letters. There are few productive trigraphs in English; one is tch as in watch.
The trigraph sch is German, where it is equivalent to the English sh; like English sh, it is not regarded as an independent letter of the alphabet. In Hungarian, the trigraph dzs is treated as a distinct letter, with its own place in the alphabet. It is pronounced like an English "j" /dʒ/. The combination gli in Italian can also be a trigraph, representing the palatal lateral approximant /ʎ/ before vowels other than i.
Although trigraphs are not uncommon in Latin alphabets, they are rare elsewhere. There are several in Cyrillic alphabets, which for example uses five trigraphs and a tetragraph in the Kabardian alphabet: гъу /ʁʷ/, кӀу /kʷʼ/, къу /qʷʼ/, кхъ /q/, хъу /χʷ/, and кхъу /qʷ/. While most of these can be thought of as consonant + /w/, the letters in кхъ /q/ cannot be so separated: the х has the negative meaning that кхъ is not ejective, as къ is /qʼ/. (See List of Cyrillic digraphs.)
Hangul has a few vowel trigraphs, ㅙ /wɛ/ and ㅞ /we/ (from oai and uei), which are not entirely predictable. There is also a single obsolete consonant trigraph, ㅹ *[v̥], a theoretical form not actually found in any texts, which is the digraph ㅃ *[b̥] plus a bottom circle used to derive the labio-dental series of consonants.
American Sign Language uses a multigraph of the American manual alphabet to sign 'I love you', from the English initialism ILY. It consists of the little finger of the letter I plus the thumb and forefinger of the letter L. It is conceived of as a trigraph of the letters I-L-Y, though the letter Y (little finger and thumb) overlaps with the other two letters.
Japanese kana use trigraphs for Cyō sequences, as in きょう kyou /kjoo/ 'today'; the う is only pronounced /o/ after another /o/.
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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
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