F-puzzles - CtC app - SudokuLab - Penpa+
==== RULES ====
Normal Sudoku rules apply : fill the grid with digits 1 to 9 appearing each exactly once in every row, column and 3x3 box.
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Thanks to Sam Cavnar-Johnson , Niverio and HakaNN for testing.
Solution code: Digits from Row 5 (left to right) followed by Column 2 (from top to bottom). 18 digits, no space character.
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