  We investigate the cases where a set $S$ of states $\{\ket{\psi_i} \}$ cannot
be cloned by itself, but is clonable with the help of another system prepared
in state $\hat{\rho}_i$. When $S$ is pair-wise nonorthogonal, it is known that
one can generate the copy from $\hat{\rho}_i$ alone, with no interaction with
the original system. Here we show that a set containing orthogonal pairs
exhibits a property forming a striking contrast; For any such set, there is a
choice of $\hat{\rho}_i$ that enables cloning only when the two systems are
interacted in a purely quantum manner that is not achievable via classical
communication.
