  Light and heavy clusters are calculated for asymmetric warm nuclear matter in
a relativistic mean-field approach. In-medium effects, introduced via a
universal cluster-meson coupling, and a binding energy shift contribution,
calculated in a Thomas-Fermi approximation, were taken into account. This work
considers, besides the standard lightest bound clusters $^4$He, $^3$He, $^3$H,
and $^2$H, also stable and unstable clusters with higher number of nucleons, in
the range $5\leq A \leq 12$, as it is natural that heavier clusters also form
in core-collapse supernova matter, before the pasta phases set in. We show that
these extra degrees of freedom contribute with non-negligible mass fractions to
the composition of nuclear matter, and may prevail over deuterons and $\alpha$
particles at high density in strongly asymmetric matter, and not too high
temperatures. The presence of the light clusters reduces the contribution of
heavy clusters to a much smaller density range, and to a smaller mass fraction.
