C2N−1m−2C^{2} N^{-1} m^{-2}C2N−1m−2
C2Nm−2\mathrm{C}^{2} \mathrm{Nm}^{-2}C2Nm−2
Nm2C−2\mathrm{Nm}^{2} \mathrm{C}^{-2}Nm2C−2
Nm2C2\mathrm{Nm}^{2} \mathrm{C}^{2}Nm2C2
