What is Follow(X) when there's a rule, A -> XBCD where First(B) and First(C) contain empty, but First(D) do not I have a question about follow sets. 

Suppose there's a rule,


  A -> XBCD
  
  B -> $\beta$ | $\epsilon$ 
  
  C -> $\gamma$ | $\epsilon$
  
  D -> $\delta$ 


What is Follow(X)?

Is it (First(B) - $\epsilon$) $\cup$  (First(C) - $\epsilon$) $\cup$ First(D) = {$\beta$ , $\gamma$, $\delta$ } ?
I am answering my own question. As @rici made a comment, I misunderstood the meaning of Greek letters in the discussion of Follow sets in the book I am reading. Greek letters mean sequences of symbols.

Using the definition, 


  If there is a production B-> $\alpha$ A $\gamma$, then First ($\gamma$)
   - {$\epsilon$} is in Follow (A)


First(BCD) is in Follow(X) where 


  A -> XBCD


BCD corresponds to $\gamma$ in the definition.