  In this paper, we reformulate Moeglin's explicit construction of local
A-packets of split odd special orthogonal groups and symplectic groups. By this
reformulation together with results of the previous paper with Minguez, we can
compute the A-packets explicitly. Also, we give a non-vanishing criterion of
our parametrization, and an algorithm to compute certain derivatives. Finally,
we prove a formula for the Aubert duals of irreducible representations of
Arthur type.

Representation Theory;Number Theory