  It is shown, concerning equivalent classes, that on a one-dimensional lattice
with nearest neighbor interaction, there are only four independent models
possessing double-shocks. Evolution of the width of the double-shocks in
different models is investigated. Double-shocks may vanish, and the final state
is a state with no shock. There is a model for which at large times the average
width of double-shocks will become smaller. Although there may exist stationary
single-shocks in nearest neighbor reaction diffusion models, it is seen that in
none of these models, there exist any stationary double-shocks. Models
admitting multi-shocks are classified, and the large time behavior of
multi-shock solutions is also investigated.
