Denise's birthday brainteaser: can you solve it?

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Alex Bellos will be setting a Monday every two weeks. In this, the first in the series, Alex has an exclusive new puzzle, set by Dr Yeo, creator of viral hit the Cheryl problem. We'll reveal the solution tomorrow. Can you solve it?
The Guardian on YouTube:

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how can albert know the solution? he has still more options! I think bernard is in this solution the one who knows it...

BostjanBele