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Sample puzzles can be 4×4 grids with 2×2 regions; 5×5 grids with pentomino regions have been published under the name Logi-5; the World Puzzle Championship has featured a 6×6 grid with 2×3 regions and a 7×7 grid with six heptomino regions and a disjoint region.
These puzzles typically have anywhere from 5 to 9 rows. The number of rows is always equal to the number of columns. The regions are polyominos made of the same number of squares that are in any one row of the puzzle. The irregularity of the regions compensates for the relatively small number of givens. 4×4 – Shi Doku. Four 2×2 regions.
Poverty incidence of Calabarzon 2.5 5 7.5 10 12.5 15 2006 10.27 2009 11.92 2012 10.92 2015 12.46 2018 7.15 2021 7.20 Source: Philippine Statistics Authority Calabarzon is the second largest contributor to the national GDP, accounting for 17% of the gross domestic product. The region boasts a 2.1% inflation rate, lower than the national average of 3%. The region has a 9.2% unemployment rate ...
Crossword. A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are ...
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Mathematical context. The general problem of solving Sudoku puzzles on n2 × n2 grids of n × n blocks is known to be NP-complete. [8] A puzzle can be expressed as a graph coloring problem. [9] The aim is to construct a 9-coloring of a particular graph, given a partial 9-coloring. The Sudoku graph has 81 vertices, one vertex for each cell.
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