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  2. Unavoidable pattern - Wikipedia

    en.wikipedia.org/wiki/Unavoidable_pattern

    A pattern is an unavoidable pattern (also called blocking term) if is unavoidable on any finite alphabet.. If a pattern is unavoidable and not limited to a specific alphabet, then it is unavoidable for any finite alphabet by default.

  3. Alphabet (formal languages) - Wikipedia

    en.wikipedia.org/wiki/Alphabet_(formal_languages)

    A common alphabet is {0,1}, the binary alphabet, and a "00101111" is an example of a binary string. Infinite sequences of symbols may be considered as well (see Omega language ). It is often necessary for practical purposes to restrict the symbols in an alphabet so that they are unambiguous when interpreted.

  4. C (programming language) - Wikipedia

    en.wikipedia.org/wiki/C_(programming_language)

    This is an accepted version of this page This is the latest accepted revision, reviewed on 17 January 2025. General-purpose programming language "C programming language" redirects here. For the book, see The C Programming Language. Not to be confused with C++ or C#. C Logotype used on the cover of the first edition of The C Programming Language Paradigm Multi-paradigm: imperative (procedural ...

  5. Formal language - Wikipedia

    en.wikipedia.org/wiki/Formal_language

    A word over an alphabet can be any finite sequence (i.e., string) of letters. The set of all words over an alphabet Σ is usually denoted by Σ * (using the Kleene star). The length of a word is the number of letters it is composed of. For any alphabet, there is only one word of length 0, the empty word, which is often denoted by e, ε, λ or ...

  6. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    A regex pattern matches a target string. The pattern is composed of a sequence of atoms. An atom is a single point within the regex pattern which it tries to match to the target string. The simplest atom is a literal, but grouping parts of the pattern to match an atom will require using ( ) as metacharacters.

  7. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    Question mark: 0032 U+0040 @ 64 0100 At sign: 0033 Latin Alphabet: Uppercase: U+0041 A 65 0101 Latin Capital letter A: 0034 U+0042 B 66 0102 Latin Capital letter B: 0035 U+0043 C 67 0103 Latin Capital letter C: 0036 U+0044 D 68 0104 Latin Capital letter D: 0037 U+0045 E 69 0105 Latin Capital letter E: 0038 U+0046 F 70 0106 Latin Capital letter ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Six-bit character code - Wikipedia

    en.wikipedia.org/wiki/Six-bit_character_code

    A six-bit character code is a character encoding designed for use on computers with word lengths a multiple of 6. Six bits can only encode 64 distinct characters, so these codes generally include only the upper-case letters, the numerals, some punctuation characters, and sometimes control characters.