Once a week we publish a new question on our facebook, Twitter and instagram page.

The correct answer and solution are published here at the same time.

Click ‘more…’ to read the solution.

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Click ‘more…’ to read the solution.

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Click ‘more…’ to read the solution.

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Click ‘more…’ to read the solution.

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Click ‘more…’ to read the solution.

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Click ‘more…’ to read the solution.

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Click ‘more…’ to read the solution.

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Click ‘more…’ to read the solution.

(more…)

Click ‘more…’ to read the solution.

(more…)

Click ‘more…’ to read the solution.

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