C-RGEP	Constrained RGEP (i.e., RGEP with gene constraint)
EA	Evolutionary Algorithm
ERC	Ephemeral Random Constant
GA	Genetic Algorithm
GE	Grammatical Evolution
GEP	Gene Expression Programming
GP	Genetic Programming
NLSE	Normalized Least Squares Error
RGEP	Robust Gene Expression Programming
RPN	Reverse Polish Notation
SR	Symbolic Regression