[['state (class)', 'vacator', 'reason for change', 'successor', 'date of successors formal installation'], ['delaware (1)', 'george r riddle (d)', 'died march 29 , 1867', 'james a bayard , jr (d)', 'april 5 , 1867'], ['arkansas (2)', 'vacant', 'arkansas re - admitted to the union', 'alexander mcdonald (r)', 'june 22 , 1868'], ['arkansas (3)', 'vacant', 'arkansas re - admitted to the union', 'benjamin f rice (r)', 'june 23 , 1868'], ['florida (3)', 'vacant', 'florida re - admitted to the union', 'thomas w osborn (r)', 'june 25 , 1868'], ['louisiana (2)', 'vacant', 'louisiana re - admitted to the union', 'john s harris (r)', 'july 8 , 1868'], ['louisiana (3)', 'vacant', 'louisiana re - admitted to the union', 'william p kellogg (r)', 'july 9 , 1868'], ['alabama (2)', 'vacant', 'alabama re - admitted to the union', 'willard warner (r)', 'july 13 , 1868'], ['alabama (3)', 'vacant', 'alabama re - admitted to the union', 'george e spencer (r)', 'july 13 , 1868'], ['maryland (1)', 'reverdy johnson (d)', 'resigned july 10 , 1868', 'william p whyte (d)', 'july 13 , 1868'], ['north carolina (2)', 'vacant', 'north carolina re - admitted to the union', 'joseph c abbott (r)', 'july 14 , 1868'], ['north carolina (3)', 'vacant', 'north carolina re - admitted to the union', 'john pool (r)', 'july 14 , 1868'], ['south carolina (2)', 'vacant', 'south carolina re - admitted to the union', 'thomas j robertson (r)', 'july 15 , 1868'], ['south carolina (3)', 'vacant', 'south carolina re - admitted to the union', 'frederick a sawyer (r)', 'july 16 , 1868']]
Arkansas is 1 of the 7 State who had a Successor Formal Installation during the year of 1868
[ENT] is 1 of the 7 [ENT] who had a [ENT] during the year of [ENT]