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2. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

3. Playfair cipher - Wikipedia

   en.wikipedia.org/wiki/Playfair_cipher

   Playfair cipher. The Playfair cipher uses a 5×5 grid of letters, and encrypts a message by breaking the text into pairs of letters and swapping them according to their positions in a rectangle within that grid: "HI" becomes "BM". The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique ...

4. List of Cyrillic letters - Wikipedia

   en.wikipedia.org/wiki/List_of_Cyrillic_letters

   This is a list of letters of the Cyrillic script. The definition of a Cyrillic letter for this list is a character encoded in the Unicode standard that a has script property of 'Cyrillic' and the general category of 'Letter'. An overview of the distribution of Cyrillic letters in Unicode is given in Cyrillic script in Unicode.

5. Letter frequency - Wikipedia

   en.wikipedia.org/wiki/Letter_frequency

   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. 801–873 AD), who formally developed the method (the ciphers breakable by this technique go ...

6. Fill-In (puzzle) - Wikipedia

   en.wikipedia.org/wiki/Fill-In_(puzzle)

   Fill-Ins, also known as Fill-It-Ins or Word Fill-Ins, are a variation of the common crossword puzzle in which words, rather than clues, are given, and the solver must work out where to place them. [1][2][3][4] Fill-Ins are common in puzzle magazines along with word searches, cryptograms, and other logic puzzles. [5]

7. Scrabble letter distributions - Wikipedia

   en.wikipedia.org/wiki/Scrabble_letter_distributions

   The score of 20 for a K is the highest known point value for any letter in any Scrabble score distribution worldwide. The fourth distribution, which uses U instead of V, and includes Y, is as follows: [ 34 ] 2 blank tiles (scoring 0 points) 1 point: E ×10, A ×9, I ×9, S ×9, T ×9, U ×9. 2 points: M ×6, N ×6, O ×6, R ×6.