$\left\{\begin{matrix}C=\frac{EGHLNT}{25M}\text{, }&M\neq 0\\C\in \mathrm{C}\text{, }&\left(L=0\text{ or }E=0\text{ or }N=0\text{ or }G=0\text{ or }T=0\text{ or }H=0\right)\text{ and }M=0\end{matrix}\right.$

$\left\{\begin{matrix}C=\frac{EGHLNT}{25M}\text{, }&M\neq 0\\C\in \mathrm{R}\text{, }&\left(L=0\text{ or }E=0\text{ or }N=0\text{ or }G=0\text{ or }T=0\text{ or }H=0\right)\text{ and }M=0\end{matrix}\right.$