In the circled area, there can be 2 possible triples(569 and 589) , how would I know which one's the right one? and why can't the other be chosen?

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  • Hodoku

    Hodoku is a solver/generator/trainer/analyzer for standard sudoku.

  • If you want to get better at solving progressively more challenging puzzles, Sudoku.com is not a good app. The really good ones have a wide range of good puzzles, are customizable to suit the level of support you like and have a good hinting system which can point out the next logical step even for brutally hard puzzles (not “Bowman's Bingo”!). Check out the Enjoy Sudoku apps, Andoku 3 (Android), Sudoku 10'000 (Android), Good Sudoku (iOS) or my go-to web app SudokuExchange.com. If you are on a desktop computer, HoDoKu is still the gold standard, although its developer passed away around a decade ago.

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    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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