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    Its ok now. Thanks for quick fix!

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    I've found next tests in random tests suite:

    Incorrect answer for board:

    000|000|080
    258|790|000
    041|036|257
    ---+---+---
    106|179|504
    109|400|076
    004|368|910
    ---+---+---
    792|600|143
    000|010|005
    005|203|008
    

    Fourth and Fifth lines are started from 1 "106......" and "109......". Thats invalid sudoku board, because we have duplicate value (1) in first column.

    Incorrect answer for board:

    009|088|040
    002|000|630
    304|625|870
    ---+---+---
    405|168|090
    080|509|120
    100|702|500
    ---+---+---
    008|203|400
    006|890|307
    

    In first line we have duplicate value (8) (...088...)

    And so on.

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    In Java version I've found next fixed test with unbalanced parenthesis (26 left, 27 right):
    (((()()(()(()()()(()()(()()(()))))))(()))()(()()()))) (note 4 closing brackets at the end).

    Following error message for this test is:
    2*(2*(2*(1+1+2*(1+2*(1+1+1+2*(1+1+2*(1+1+2*(1))))))+2*(1))+1+2*(1+1+1))) = 790 ... (note 3 closing brackets at the end).

    It should be fixed.

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    In searchArrows method (7th line): while (j > 0 && string.charAt(j) == ...) {

    Should be: while (j >= 0 && string.charAt(j) == ...) {

    Mine solution pass by luck (after almost 10 attempts), but others cannot solve this kata in Java for this reason (IMO).
    In any case, I appreciate your contribution for Java branch. Thanks for all your work!

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    When I saw low satisfaction rating and few completions for this kata I was afraid. If you in doubt will or not just jump in this kata. It is solveable, well designed and can give you good experience. Many thanks for Gigabyte series!

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    Maybe I'm late with help.
    You are completing hand with fifth 3 in this case.
    Description says: Note that there are EXACTLY 4 identical copies of each kind of tiles in a deck.

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    Many thanks for kingdoms episodes!

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    For this task your solution is good enough. I'll vote it up.

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    Many thanks for feedback. I'm not a programmer, and I do not pretend on Best Practice Solution for all tasks that I've solved on this webcite. In my opinion this task is not about performance. My O(n^2) solution was good for test conditions and I'm happy. I've recommend 6kyu kata Grazing Donkey by hobovsky and 6kyu kata Count a Spiral by Flurin Brühwiler. This katas is about performance. Good luck and have fun.

    p/s Your solution on this kata in top 10% in my opinion and I'll vote it up.