  Singly-Cabibbo-suppressed decays of charmed particles governed by the quark
subprocesses $c \to s u \bar s$ and $c \to d u \bar d$ are analyzed using a
flavor-topology approach, based on a previous analysis of the Cabibbo-favored
decays governed by $c \to s u \bar d$. Decays to $PP$ and $PV$, where $P$ is a
pseudoscalar meson and $V$ is a vector meson, are considered. We include
processes in which $\eta$ and $\eta '$ are produced.
