Tsumego problem

Today I tried this TsumegoPro problem.

The provided answer is this;

Answer

But I don’t see how black should proceed if white responds this way;

Variation

Can anyone see the way?
Thank you

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image
Then A and B are miai.

Capturing at A11 instead of A or B doesn’t help, because black throws in at 5, and then A and B are still miai.
image

This white 4 also doesn’t work:

All of this relies on the presence of black’s stone at A7.

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Thank you very much
I overlooked B10

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