  We analyze the two-body nonleptonic weak decays of charmed baryons, employing
the pole approximation in tandem with the $SU(3)_F$ symmetry. We are able to
make novel predictions for decay channels of $\Omega_c^0 \to {\bf B}_n P$ and
${\bf B}_{cc}\to {\bf B}_c^{A,S} P$ based on the experimental data of ${\bf
B}_c^A \to {\bf B}_n P$. Here, ${\bf B}_n$, ${\bf B}_{c}^A$, ${\bf B}_c^S$ and
${\bf B}_{cc}$ are the low-lying octet, antitriplet charmed, sextet charmed and
doubly charmed baryons, respectively, and $P$ is the pseudoscalar meson. Our
findings reveal that the fitted effective Wilson coefficient ${\cal C}_+=0.469$
is notably smaller than the naive expectation, and the low-lying pole
approximation fails to account for ${\cal B}(\Lambda_c^+ \to n \pi^+ , \Xi^0
K^+)$, despite consistencies with the soft-meson limit. We further recommend
the decay channel $\Xi_{cc}^+ \to \Xi_c^0 \pi^+ \to \Xi^- \pi^+\pi^+\pi^+\pi^-$
for exploring evidence of $\Xi_{cc}^+$, estimating the branching fraction at
$(1.1\pm 0.6)\times 10^{-3}$.
