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Fill in the missing numbers with the digits 1 to 9. A diamond shape in the middle means that the four numbers around it add to 20.

Each uses a different way to add to 20, i.e. if there is already 1 + 3 + 8 + 9, then there will not be another using the digits 1, 3, 8 and 9 (in any order). The same digit isn't allowed to touch, even diagonally.

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 [Ref: ZRSR] © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (195.08) and is used with permission.

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