  We analyze two pairs of doublet states for the two Anderson impurity problem.
We found that for short interimpurity distances they have a lower energy than
the ferro triplet and the antiferro singlet. For medium to long distances
between the impurities, the doublets also have a lower energy than the two
decoupled Kondo-singlet state for most of the range of interest. The mechanism
behind their energy gain is an coherence enhanced Kondo-like interaction.
