...[*]
Naturally, we performed a number of smaller runs while developing the fitness function.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
...fig:best_programs.[*]
The programs in Figure 6 were first syntactically simplified replacing expressions involving only constants with their value and expressions of the form (if True ExpA ExpB) or (if False ExpA ExpB) with ExpA and ExpB, respectively. Then, starting from the leaves, we replaced sub-trees with their median output if the replacement influenced fitness by less than 2%.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.