Comment and Equations (1a) (1b)

[1] Comment paragraph ( don't need to use in winedt ):
\iffalse
...
\fi
======= or =======
\usepackage{verbatim}
\begin{comment}
...
\end{comment}

[2] Get equations (1a)(1b):
\usepackage{amsmath}
\begin{subequations}
\begin{equation}
c_n = \underline g_n^T \, \underline {h_s}_k
\end{equation}
\begin{equation}
\underline \alpha=\left( \underline G^T \, \underline G \right)
^{-1} \underline c
\end{equation}
\end{subequations}