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Place the numbers $1$ to $6$ in the circles so that each number is the difference between the two numbers just below it.

6 circles
Example:   $5 - 2 = 3$

You could try it in this interactivity.
Full screen version
This text is usually replaced by the Flash movie.
When you have tried this and got more than one answer you could try other things like having $4$ rows of discs and use the number $1$ to $10$