abstract = "This paper introduces two new crossover operators for
Genetic Programming (GP). Contrary to the regular GP
crossover, the operators presented attempt to preserve
the context in which subtrees appeared in the parent
trees. A simple coordinate scheme for nodes in an
S-expression tree is proposed, and crossovers are only
allowed between nodes with exactly or partially
notes = "Two new crossover operators for GP (Strong Context
preserving (SCPC) and Weak context preserving(WCPC)).
These attempt to preserve the context of swapped
subtrees. SCPC best used 50percent with Koza crossover.
100percent WCPC not performing as well.