Seja $\displaystyle L=\underset{x\rightarrow
+\infty}{\lim}\frac{x^{2}-1}{x^{3}+x+1}$
\begin{enumerate}pyB
subst=["$L=0$.","$L=1$.","$L=+\infty$.","$L=-\infty$."]
unsorted=shuffle( subst )
certa[0]=unsorted[0]
opts=unsorted[1]
for i in opts:
    emit( "\n\\item ", i)
pyE
\end{enumerate}