a22 g\frac{\mathrm{a}^{2}}{2 \mathrm{~g}}2 ga2
a24 g\frac{\mathrm{a}^{2}}{4 \mathrm{~g}}4 ga2
a28 g\frac{\mathrm{a}^{2}}{8 \mathrm{~g}}8 ga2
a22 g2\frac{\mathrm{a}^{2}}{2 \mathrm{~g}^{2}}2 g2a2