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  2. 15 puzzle - Wikipedia

    en.wikipedia.org/wiki/15_puzzle

    The exceptional graph is a regular hexagon with one diagonal and a vertex at the center added; only ⁠ 1 / 6 ⁠ of its permutations can be attained, which gives an instance of the exotic embedding of S 5 into S 6. For larger versions of the n puzzle, finding a solution is easy. But, the problem of finding the shortest solution is NP-hard.

  3. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    In a sense, subtraction is the inverse of addition. That is, c = a − b if and only if c + b = a. In words: the difference of two numbers is the number that gives the first one when added to the second one. Subtraction follows several important patterns. It is anticommutative, meaning that changing the order changes the sign of the answer.

  4. Dolch word list - Wikipedia

    en.wikipedia.org/wiki/Dolch_word_list

    The Dolch word list is a list of frequently used English words (also known as sight words), compiled by Edward William Dolch, a major proponent of the "whole-word" method of beginning reading instruction. The list was first published in a journal article in 1936 [1] and then published in his book Problems in Reading in 1948. [2]

  5. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The word mathematics comes from the Ancient Greek word máthēma (μάθημα), meaning ' something learned, knowledge, mathematics ', and the derived expression mathēmatikḗ tékhnē (μαθηματικὴ τέχνη), meaning ' mathematical science '. It entered the English language during the Late Middle English period through French and ...

  6. Sarah Palin - Wikipedia

    en.wikipedia.org/wiki/Sarah_Palin

    Sarah Louise Palin (/ ˈ p eɪ l ɪ n / ⓘ PAY-lin; née Heath; born February 11, 1964) is an American politician, commentator, and author who served as the ninth governor of Alaska from 2006 until her resignation in 2009.

  7. At-grade - Wikipedia

    en.wikipedia.org/wiki/At-grade

    At-grade may refer to: At-grade intersection, a crossing between roads on the same level; Road junction; Level crossing, where a road or path crosses a railway on the same level; Diamond crossing, where two railway tracks cross; At-grade railway, at level with the general surface

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