  We propose a predictive building-up of tetrahedral molecules, based on a
previously derived chirality index, which characterizes a tetrahedral molecule,
with n chiral centers, as achiral, diastereoisomer, or enantiomer as a function
of the observed inversions (at most one for each center) under rotation and
superimposition to its mirror immage. The set of rules which is identified
allows the classification of the new molecule, obtained by the addition of
another chiral center, by the determination of the selection rule with respect
to the added center.
