\begin{frame}
  \small
  
  \vspace{-1ex}
  
  \begin{example}
  \smallskip
  TRS $\RR$
  \[
  \begin{array}{lr@{~}c@{~}l@{\qquad}lr@{~}c@{~}l}
  \structure{\text{\ding{192}}} & \GREEN{x+\m{0}}
  & \GREEN{\to} & \GREEN{x} &
  \structure{\text{\ding{193}}} & \GREEN{x-\m{0}}
  & \GREEN{\to} & \GREEN{x}
  \\
  \structure{\text{\ding{194}}} & \GREEN{x+\m{s}(y)}
  & \GREEN{\to} & \GREEN{\m{s}(x+y)} &
  \structure{\text{\ding{195}}} & \GREEN{x-\m{s}(y)}
  & \GREEN{\to} & \GREEN{\m{p}(x-y)}
  \\
  \structure{\text{\ding{196}}} & \GREEN{\m{p}(\m{s}(x))}
  & \GREEN{\to} & \GREEN{x} &
  \structure{\text{\ding{197}}} & \GREEN{\m{s}(\m{p}(x))}
  & \GREEN{\to} & \GREEN{x}
  \\
  \onslide<7->{\alert{\text{\ding{198}}}} &
  \onslide<7->{\alert{\m{s}(x+\m{p}(y))}}
  & \onslide<7->{\alert{\to}} & \onslide<7->{\alert{x+y}} &
  \onslide<8->{\alert{\text{\ding{199}}}} &
  \onslide<8->{\alert{\m{p}(x-\m{p}(y))}}
  & \onslide<8->{\alert{\to}} & \onslide<8->{\alert{x-y}}
  \end{array}
  \]
  \vspace{-3ex}
  \begin{itemize}
  \item<2->
  \makebox[2cm][l]{SN \only<2>{?}} \onslide<3->
  (e.g.) LPO with precedence $\GREEN{+} > \mG{s}$ and $\GREEN{-} > \mG{p}$
  \item<4->
  \makebox[2cm][l]{WCR ?} \onslide<5->
  4 critical pairs
  \vspace{-1ex}
  \begin{tabbing}
  \begin{tikzpicture}[on grid,baseline=(1).baseline,node distance=17mm]
  \node (1) {\MG{\ol{x+\ul{\m{s}(\m{p}(y))}}}};
  \node (2) [below left=of 1]  {\MGr{x+y}};
  \node (3) [below right=of 1] {\MGl{\m{s}(x+\m{p}(y))}};
  \draw[->] (1) -- (2) node[midway,left]  {\ssd{197}};
  \draw[->] (1) -- (3) node[midway,right] {\ssd{194}};
  \onslide<7->{\alert{
  \draw[->] (3) -- (2) node[midway,below] {\scriptsize \ding{198}};
  }}
  \end{tikzpicture}
  \qquad\qquad\qquad \=
  \begin{tikzpicture}[on grid,baseline=(1).baseline,node distance=17mm]
  \node (1) {\MG{\ol{x-\ul{\m{s}(\m{p}(y))}}}};
  \node (2) [below left=of 1]  {\MGr{x-y}};
  \node (3) [below right=of 1] {\MGl{\m{p}(x-\m{p}(y))}};
  \draw[->] (1) -- (2) node[midway,left]  {\ssd{197}};
  \draw[->] (1) -- (3) node[midway,right] {\ssd{195}};
  \onslide<8->{\alert{
  \draw[->] (3) -- (2) node[midway,below] {\scriptsize \ding{199}};
  }}
  \end{tikzpicture}
  \\[.5ex]
  \begin{tikzpicture}[on grid,baseline=(1).baseline,node distance=17mm]
  \node (1) {\MG{\ol{\m{p}(\ul{\m{s}(\m{p}(x))})}}};
  \node (2) [below left=of 1]  {\MGr{\m{p}(x)}};
  \node (3) [below right=of 1] {\MGl{\m{p}(x)}};
  \draw[->] (1) -- (2) node[midway,left]  {\ssd{197}};
  \draw[->] (1) -- (3) node[midway,right] {\ssd{196}};
  \onslide<6->{
  \path (2) -- (3) node[midway] {\strut $\alert<6>{=}$};
  }
  \end{tikzpicture}
  \>
  \begin{tikzpicture}[on grid,baseline=(1).baseline,node distance=17mm]
  \node (1) {\MG{\ol{\m{s}(\ul{\m{p}(\m{s}(x))})}}};
  \node (2) [below left=of 1]  {\MGr{\m{s}(x)}};
  \node (3) [below right=of 1] {\MGl{\m{s}(x)}};
  \draw[->] (1) -- (2) node[midway,left]  {\ssd{196}};
  \draw[->] (1) -- (3) node[midway,right] {\ssd{197}};
  \onslide<6->{
  \path (2) -- (3) node[midway] {\strut $\alert<6>{=}$};
  }
  \end{tikzpicture}
  \end{tabbing}
  \end{itemize}
  \end{example}
\end{frame}