Blurb::
Perform crossover by choosing design variable(s)
Description::
The final crossover type is ``shuffle_random``.  This crossover type
performs crossover by choosing design variables at random from a
specified number of parents enough times that the requested number of
children are produced.  For example, consider the case of 3 parents
producing 2 children.  This operator would go through and for each
design variable, select one of the parents as the donor for the child.
So it creates a random shuffle of the parent design variable values.
The relative numbers of children and parents are controllable to allow
for as much mixing as desired.  The more parents involved, the less
likely that the children will wind up exact duplicates of the parents.
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