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480 B

\begin{center}
\begin{forest}
for tree={circle, draw,
minimum size=2em,
inner sep=0pt,
s sep=2mm,
l sep=1mm}
[$\lnot$, name=not_one
[$\lor$, name=or
[$a$, name=a]
[$\lnot$, name=not_two
[$b$, name=b
[$\lnot$, name=not_three]
]
]
]
]
\end{forest}
\end{center}
One leaf is labeled with a logical operator, which is not allowed.
Thus this is not a well-formed formula.