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\begin{enumerate}
\item $b:$ \quad Bob wins the lottery. \\
$n:$ \quad Bob gets all the numbers right.
$$ b \biimp n$$
\item $S:$ \quad Mozart was born in Salzburg. \\
$I:$ \quad Mozart was born in Innsbruck
$$ S \land \neg I $$
\item $l:$ \quad The year is a leap-year. \\
$f:$ \quad Februar has 29 days.
$$ l \imp f $$
\end{enumerate}