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Fives Sudoku (603)

Instruction:
Apply classic sudoku rules. Additionally, adjacent cells containing numbers whose sum or difference is 5 are marked. Adjacent cells with no marking must not contain numbers whose sum or difference is 5.

Reference: WPF (1)

Examples:
WPF Sudoku GP 2016 - Round 2 (99)
Parent puzzle:
Sudoku
Related puzzles:
Neighbor Sums Sudoku