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\begin{itemize}
\item \emph{Constants} in $\Sigma$, \emph{variables}, and
applications of function symbols in $\Sigma$ where all inputs are $\mathcal{T}$-terms are $\mathcal{T}$-terms.
\item A $\mathcal{T}$-atom is the application of a predicate symbol in $\Sigma$ where all inputs are $\mathcal{T}$-terms.
\item A $\mathcal{T}$-literal is a $\mathcal{T}$-atoms or its negation.
\end{itemize}