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Anti-Windoku (810)

Other names: Antiwindoku

Instruction:
Apply classic sudoku rules. Each shaded region contains exactly 4 distinct digits.

Reference: WPF (1)

Examples:
WPF Sudoku GP 2019 - Round 6 (129)
WPF Sudoku GP 2020 - Round 1 (148)
WPF Sudoku GP 2020 - Round 2 (149)
WPF Sudoku GP 2022 - Round 3 (175)
Parent puzzle:
Windoku