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Identifying functional dependencies

I'm having trouble understanding the logic in use for identifying functional dependancies. Looking at the sample relation below, I understand fd1 - fd3. But when I look at fd4 and fd5, its logic ...
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Functional Dependencies Query

I am having a confusion in Functional Dependencies I have a relation R(A,B,C,D,E,F) Where {A, B} is the key And the FD set I have is {A->FC, C->D, B->E} What Normal Form is it in? Basically I want ...