Six friends—A, B, C, D, E, and F—are sitting around a circular table facing the center. The following information is known:  
  
     A is sitting immediately to the left of B.  
     C is sitting two places to the right of A.  
     D is sitting opposite to E.  
     F is not sitting next to C or D.  
  
Question: What is the position of F relative to A?