input: Abdulsalami_Abubakar | successor | Olusegun_Obasanjo Olusegun_Obasanjo | inOfficeWhileVicePresident | Atiku_Abubakar
target: Abdulsalami Abubakar's successor was Olusegun Obasanjo who was in office while Atiku Abubaker was Vice President.