There are eight friends, namely A, B, C, D, E, F, G and H, sitting around a circular table facing the centre but not necessarily in the same order. F, is the immediate neighbour of D. C is second to the right of A. There are only two persons between A and D. E and G are immediate neighbours, while H and F are also immediate neighbours. B is third to the left of F. D is third to the left of G. How many persons are sitting between B and G, when counted in clockwise direction from B?