ase, and on the search parameters to each
generator clause.

<p>Instead, <code>select</code> single-steps each generator clause in turn, in a
round-robin scheme, applies the filter clauses to each generated object, and
re-arranges the order of generator clauses so that the more successful clauses
will be preferred. This process usually converges quickly and efficiently.


<p><hr>
<h3><a id="combined">Combined Indexes</a></h3>

<p>A generator clause can also combine several (similar) indexes into a single
on