\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.