Select the term that can replace the question mark (?) in the following series. BK, FJ, JI, NH, VF

SE SG RG RE

RG

BK, FJ, JI, NH, VF The logic followed  here is : B → (+4) → F → (+4) → J → (+4) → N → (+4) →V K → (-1) → J → (-1) → J → (-1) → H → (-1) → F