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$f = (a \land b \land c) \lor (a \land \lnot b \land c) \lor (a \land b \land \lnot c \land e) \lor (a \land \lnot b \land \lnot c \land e) \lor 
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(a \land b \land \lnot c \land \lnot e) \lor (a \land \lnot b \land \lnot c \land \lnot e) \lor (\lnot a \land c \land e) \lor (\lnot a \land c \land \lnot e) \lor 
\newline
(\lnot a \land \lnot c \land d \land e) \lor (\lnot a \land \lnot c \land d \land \lnot e)$
\end{center}