  This paper investigates reversibility properties of 1-dimensional
3-neighborhood d-state finite cellular automata (CAs) of length n under
periodic boundary condition. A tool named reachability tree has been developed
from de Bruijn graph which represents all possible reachable configurations of
an n-cell CA. This tool has been used to test reversibility of CAs. We have
identified a large set of reversible CAs using this tool by following some
greedy strategies.
