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\begin{tikzpicture}[every tree node/.style={draw,circle},sibling distance=.25cm]
\Tree
[.$\exists x$
[.$\forall y$
[.$\imp$
[.$P$ $x$ $y$ ]
[.$\lor$
[.$Q$ $x$ $y$ ]
[.$R$ $x$ $y$ ]
]
]
]
]
\end{tikzpicture}
\newline
\begin{tikzpicture}[every tree node/.style={draw,circle},sibling distance=.25cm]
\Tree
[.$\forall y$
[.$\imp$
[.$P$ $b$ $y$ ]
[.$\lor$
[.$Q$ $b$ $y$ ]
[.$R$ $b$ $y$ ]
]
]
]
\end{tikzpicture}
\newline
Subtree: $x=b$ \\
\begin{tikzpicture}[every tree node/.style={draw,circle},sibling distance=.25cm]
\Tree
[.$\imp$
[.$P$ $b$ $a$ ]
[.$\lor$
[.$Q$ $b$ $a$ ]
[.$R$ $b$ $a$ ]
]
]
\end{tikzpicture}
\newline
Subtree: $x=b \land y=a$
\begin{tikzpicture}[every tree node/.style={draw,circle},sibling distance=.25cm]
\Tree
[.$\imp$
[.$P$ $b$ $b$ ]
[.$\lor$
[.$Q$ $b$ $b$ ]
[.$R$ $b$ $b$ ]
]
]
\end{tikzpicture}
\newline
Subtree: $x=b \land y=b$
The model $\mathcal{M}$ satisfies the formula.