  Let $\mathrm{G}$ be a subgroup of the symmetric group $\mathfrak S(U)$ of all
permutations of a countable set $U$. Let $\overline{\mathrm{G}}$ be the
topological closure of $\mathrm{G}$ in the function topology on $U^U$. We
initiate the study of the poset $\overline{\mathrm{G}}[U]:=\{f[U]\mid f\in
\overline{\mathrm{G}}\}$ of images of the functions in $\overline{\mathrm{G}}$,
being ordered under inclusion. This set $\overline{\mathrm{G}}[U]$ of subsets
of the set $U$ will be called the \emph{poset of copies for} the group
$\mathrm{G}$. A denomination being justified by the fact that for every
subgroup $\mathrm{G}$ of the symmetric group $\mathfrak S(U)$ there exists a
homogeneous relational structure $R$ on $U$ such that $\overline G$ is the set
of embeddings of the homogeneous structure $R$ into itself and
$\overline{\mathrm{G}}[U]$ is the set of copies of $R$ in $R$ and that the set
of bijections $\overline G\cap \mathfrak S(U)$ of $U$ to $U$ forms the group of
automorphisms of $\mathrm{R}$.
