The promulgation of the "Lennox-Boyd constitution" led to the expansion of the Legislative Council to 22 elected members for the 1959 elections. It provided for 12 "ordinary" seats with mostly Europeans, six "special" seats mainly reserved for Africans, two reserved for Africans and two reserved for Europeans. The UFP retained their majority, winning 13 seats. Further constitutional reforms led to another electoral system being implemented for the 1962 elections, with 15 members elected by an upper roll, 15 elected by a lower roll and 15 by both rolls together. Although the UFP won the most seats, the United National Independence Party (UNIP) and the Northern Rhodesian African National Congress (NRANC) were able to form a coalition government.