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2. List of presidents of the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_Presidents_of_the...

   The White House, official residence of the president of the United States, in July 2008. The president of the United States is the head of state and head of government of the United States, [1] indirectly elected to a four-year term via the Electoral College. [2]

3. Unicode - Wikipedia

   en.wikipedia.org/wiki/Unicode

   The 1024 points in the range U+D800 – U+DBFF are known as high-surrogate code points, and code points in the range U+DC00 – U+DFFF (1024 code points) are known as low-surrogate code points. A high-surrogate code point followed by a low-surrogate code point forms a surrogate pair in UTF-16 in order to represent code points greater than U+FFFF .

4. Hamming code - Wikipedia

   en.wikipedia.org/wiki/Hamming_code

   Hence the rate of Hamming codes is R = k / n = 1 − r / (2 r − 1), which is the highest possible for codes with minimum distance of three (i.e., the minimal number of bit changes needed to go from any code word to any other code word is three) and block length 2 r − 1.

5. File:QR Code Structure Example.svg - Wikipedia

   en.wikipedia.org/wiki/File:QR_Code_Structure...

   Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

6. C (programming language) - Wikipedia

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

   For example, the GNU Multiple Precision Arithmetic Library, the GNU Scientific Library, Mathematica, and MATLAB are completely or partially written in C. Many languages support calling library functions in C, for example, the Python-based framework NumPy uses C for the high-performance and hardware-interacting aspects.

7. List of Unicode characters - Wikipedia

   en.wikipedia.org/wiki/List_of_Unicode_characters

   A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.