How many persons sits exactly between H and D when counted from right of H?

We have provided with the information,   D sits third to the right of G. G faces the centre .  E sits third to the left of C. C does not sit in the middle of the sides. C can sit at two places either on the immediate left of G or at the immediate right of G. Case. 1 – When C sits on the immediate right of G        Case.2 – When C sits on the immediate left of G         Only one person sits between E and F. F is not an immediate neighbour of C. Case 1- F will sit on the right of E. H faces the centre. A, is not an immediate neighbour of F.   In this case A will become an immediate neighbour of F which will make this case wrong. We will continue with case 2. Case 2- F will sit on the right of E. Only place left for B is on immediate right of F. Thus the final arrangement is;