C2N−1m−2C^2N^{-1}m^{-2}C2N−1m−2
Nm2C−2Nm^2C^{-2}Nm2C−2
C2N−2m−1C^2N^{-2}m^{-1}C2N−2m−1
Nm−2C−2Nm^{-2}C^{-2}Nm−2C−2
