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Threefish is a symmetric-key tweakable block cipher designed as part of the Skein hash function, an entry in the NIST hash function competition.Threefish uses no S-boxes or other table lookups in order to avoid cache timing attacks; [1] its nonlinearity comes from alternating additions with exclusive ORs.
Pattern blocks were developed, along with a Teacher's Guide to their use, [1] at the Education Development Center in Newton, Massachusetts as part of the Elementary Science Study (ESS) project. [5] The first Trial Edition of the Teacher's Guide states: "Work on Pattern Blocks was begun by Edward Prenowitz in 1963.
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The herringbone pattern is an arrangement of rectangles used for floor tilings and road pavement, so named for a fancied resemblance to the bones of a fish such as a herring. The blocks can be rectangles or parallelograms. The block edge length ratios are usually 2:1, and sometimes 3:1, but need not be even ratios. The herringbone pattern has a ...
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Whacking with a wet trout or trouting is a common practice on Wikipedia when experienced editors slip up and make a silly mistake. It, along with sentencing to the village stocks, is used to resolve one-off instances of seemingly silly behavior amongst normally constructive community members, as opposed to long term patterns of disruptive edits, which earn warnings and blocks.
6+ fish: 6-gronk, 7-gronk – these patterns are only useful for Sudoku larger than 9×9. Remote pairs : When a long string of naked pairs that leads around the grid exists, any cells that are in the intersection of the cells at the beginning and the end of the string may not be either of the numbers in the naked pairs, for example, 4 and 7.
This image then returns to the diamond pattern and back into the checkered pattern. It then resumes with the Metamorphosis II imagery until the bird pattern. The birds then become sailing boats. From the sailing boats the image changes to a second fish pattern. Then from the fish to horses. The horses then become a second bird pattern.