Every row, column and outlined region contains all numbers from 1 to 8, one per cell. All adjacent cells which differ by 5 are marked by a dot on their common border. Symbols outside the grid indicate a property shared by the first two cells in that direction. Same symbols mean same property, different symbols mean different property. Possible properties are:
- Big: number is 5,6,7 or 8.
- Small: number is 1,2,3 or 4
- Odd: number is 1,3,5 or 7
- Even: number is 2,4,6 or 8
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