Non-Joseki Exercise 3

White 5 differs.  

Still on the 3-4 point high approach inside contact joseki, but White 5 played hane on the second line instead of a. How should Black play?

This exercise should be easier than Non-Joseki Exercise 1, but when I posed this question to someone in my club who is 16 or 17 kyu on KGS, he gave a wrong solution that is interesting enough to be mentioned here.

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