“…The gene in GEP is composed of a head and a tail. The head is composed of both function and terminal symbols (constants, variables, functions, and mathematical operators) such as (1, a, b, √, cos ,*,−, /) (Aval, Ketabdari, & Gharebaghi, 2017). The tail contains only terminals (constant and variables) such as (1, a, b, c).…”