Into what number of sublevels are the following terms split in a weak magnetic field: (a) 3P0{ }^{3} P_{0}3P0 (b) 2F5/2{ }^{2} F_{5 / 2}2F5/2 (c) 4D1/2?{ }^{4} D_{1 / 2} ?4D1/2?