\newcommand{\CELL}{\texttt{cell}}
\newcommand{\ROW}{\texttt{row}}
\newcommand{\SLDROP}{\blacktriangleleft}
-\newcommand{\SLDSCRIPT}{\blacktriangleleft_{s}}
\newcommand{\NLDROP}{\vartriangleleft}
-\newcommand{\RGROUP}{\vartriangleleft_{rg}}
-\newcommand{\NLDGP}{\vartriangleleft_{g}}
-\newcommand{\NLDSCRIPT}{\vartriangleleft_{s}}
-\newcommand{\NLDMACRO}{\vartriangleleft_{c}}
-\newcommand{\NLDTABLE}{\vartriangleleft_{t}}
\begin{document}