ning (KDD'01), pages 323428. ACM Press, 2001. LP02. W. B. Langdon and IL Poli. Foundations of Genetic Programming. Springer-Verlag, 2002. Mai00. Monika Maidl. The common fragment of ctl and lel. In In IEEE Symposium on Foundations of Computer Science, pages 643-652, 2000. May04. M. T. Maybury. New Direc