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Big-Small Japanese Sums Sudoku (829)

Instruction:
Apply classic sudoku rules. Clues outside the grid indicate the sums of groups in the given order. Clues on top refer to groups of big digits (5-9). These groups are separated by at least one small digit (1-4). Clues on the left refer to groups of small digits, that are separated by at least one big digit.

Reference: WPF (1)

Examples:
WPF Sudoku GP 2019 - Round 1 (124)
Parent puzzle:
Japanese Sums Sudoku