Sudoku GP Round 4 has started and it features a new variant - Encaged 4 Sudoku. Posting a practice sudoku.
Given it is one of the mid-pointers in the round I expect the contest sudoku to be easier than this one. Nonetheless, I hope you enjoy solving this sudoku.
Rules: Apply Classic Sudoku rules. Additionally, the digit 4 may only be orthogonally adjacent to odd numbers.
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