A scheme, analogous to the linear combination of atomic orbitals, is p
roposed to calculate rates of reactions of nucleon-group transfer betw
een nuclei confined in muonic molecules. It is Pointed out that such r
ates can be rather high if the energy release of a reaction is small.
As an example, the rate of the reaction p-mu-Be-10-->t-mu-Be-8 is calc
ulated.