abstract = "For various evolutionary systems it was found that the
abundance of phenotypes in a search space, defined as
the size of their respective neutral networks, is key
to understanding the trajectory an evolutionary process
takes from an initial to a target solution. we use a
Linear Genetic Programming system to demonstrate that
the abundance of phenotypes is determined by the
combinatorics offered in its neutral components. This
translates into the size of the neutral space available
to a phenotype and also can explain the beautiful and
rather curious observation that the abundance of
phenotypes is dependent on their complexity in a
negative exponential fashion.",