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The 17 wallpaper groups, with finite fundamental domains, are given by International notation, orbifold notation, and Coxeter notation, classified by the 5 Bravais lattices in the plane: square, oblique (parallelogrammatic), hexagonal (equilateral triangular), rectangular (centered rhombic), and rhombic (centered rectangular).
This list of all two-letter combinations includes 1352 (2 × 26 2) of the possible 2704 (52 2) combinations of upper and lower case from the modern core Latin alphabet.A two-letter combination in bold means that the link links straight to a Wikipedia article (not a disambiguation page).
Example C has a different wallpaper group, called p4g or 4*2. The fact that A and B have the same wallpaper group means that they have the same symmetries, regardless of the designs' superficial details; whereas C has a different set of symmetries. The number of symmetry groups depends on the number of dimensions in the patterns.
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In writing and typography, a ligature occurs where two or more graphemes or letters are joined to form a single glyph.Examples are the characters æ and œ used in English and French, in which the letters a and e are joined for the first ligature and the letters o and e are joined for the second ligature.
In China, letters of the English alphabet are pronounced somewhat differently because they have been adapted to the phonetics (i.e. the syllable structure) of the Chinese language. The knowledge of this spelling may be useful when spelling Western names, especially over the phone, as one may not be understood if the letters are pronounced as ...
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If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online!