\begin{enumerate}
\item First item
\item Second item
.
.
.
\end{enumerate}
The enumerate environment produces a numbered list. Enumerations
can be nested within one another, up to four levels deep. They can also
be nested within other paragraph-making environments.
Each item of an enumerated list begins with an \item command.
There must be at least one \item command within the environment.
The enumerate environment uses the enumi through
enumiv counters (see section Counters). The type of numbering can be
changed by redefining \theenumi etc.