Olympiad

Normal sudoku rules apply.

Black dots separate digits where one is double the other. White dots separate consecutive digits. Not all such dots are shown.

Place digits along the circles such that:

• Blue (top left) uses digits from {1234}
• Yellow (bottom left) uses digits from {3456}
• Black (top middle) uses digits from {1256}
• Red (top right) uses digits from {56789}
• Green (bottom right) uses the digits 1 to 9 once each, in addition to the given 4