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Hi, it's me again. During my try of using GP for a symbolic regression job, I 
have two questions here.

1. I see so many constants in a formula when using the software Eureqa and 
they can change themselves to make the formula better and better. How can 
I do the same tricks with ECJ ?

2. I have known that GP may have overfitting problems. Is there anything can 
be done to avoid overfit as much as posisible in ECJ, like doing a k-fold cross 
validation ?

These two are bothering me a lot recently.