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\item \lect Consider a formula $\varphi$ in propositional logic. In the following list, tick all statements that are true.
\begin{itemize}\item[$\square$] If $\varphi$ is not satisfiable, $\neg \varphi$ is valid.\item[$\square$] If $\varphi$ is valid, $\neg \varphi$ is not valid.\item[$\square$] If $\varphi$ is valid, $\neg \varphi$ is not satisfiable.\item[$\square$] If $\varphi$ is not valid, $\neg \varphi$ is satisfiable.\end{itemize}
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