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  2. Body-part counting system - Wikipedia

    en.wikipedia.org/wiki/Body-part_counting_system

    For example, in Kobon, the body parts on the left-hand side of the body are used in order to count from 1 to 12. The count can then continue down the right-hand side of the body up to 23. [1] It is then possible to reverse the count, starting from the end point on the right as 24 back up to the 12th position on the left as 35, then down again ...

  3. Serial sevens - Wikipedia

    en.wikipedia.org/wiki/Serial_sevens

    Serial sevens (or, more generally, the descending subtraction task; DST), where a patient counts down from one hundred by sevens, is a clinical test used to test cognition; for example, to help assess mental status after possible head injury, in suspected cases of dementia or to show sleep inertia.

  4. List of sums of reciprocals - Wikipedia

    en.wikipedia.org/wiki/List_of_sums_of_reciprocals

    Then the triangle is in Euclidean space if the sum of the reciprocals of p, q, and r equals 1, spherical space if that sum is greater than 1, and hyperbolic space if the sum is less than 1. A harmonic divisor number is a positive integer whose divisors have a harmonic mean that is an integer. The first five of these are 1, 6, 28, 140, and 270.

  5. Chisanbop - Wikipedia

    en.wikipedia.org/wiki/Chisanbop

    36 represented in chisanbop, where four fingers and a thumb are touching the table and the rest of the digits are raised. The three fingers on the left hand represent 10+10+10 = 30; the thumb and one finger on the right hand represent 5+1=6. Counting from 1 to 20 in Chisanbop. Each finger has a value of one, while the thumb has a value of five.

  6. Memory span - Wikipedia

    en.wikipedia.org/wiki/Memory_span

    In a backward digit span task, the procedure is largely the same, except that subjects being tested are asked to recall the digits in backward order (e.g., if presented with the following string of numbers "1 5 9 2 3," the subject would be asked to recall the digits in reverse order; in the case, the correct response would be "3 2 9 5 1").

  7. 99 Bottles of Beer - Wikipedia

    en.wikipedia.org/wiki/99_Bottles_of_Beer

    "99 Bottles of Beer" or "100 Bottles of Pop on the Wall" is a traditional reverse counting song from the United States and Canada.It is popular to sing on road trips, as it has a very repetitive format which is easy to memorize and can take a long time when sung in full.

  8. List of siteswaps - Wikipedia

    en.wikipedia.org/wiki/List_of_siteswaps

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  9. Inversion (discrete mathematics) - Wikipedia

    en.wikipedia.org/wiki/Inversion_(discrete...

    The inversions of this permutation using element-based notation are: (3, 1), (3, 2), (5, 1), (5, 2), and (5,4). In computer science and discrete mathematics , an inversion in a sequence is a pair of elements that are out of their natural order .