Algorithm 6 Variation.

Require:$Parent1$, $Parent2$ {Individuals for variation}  1:$Child1\leftarrow Parent1$  2:$Child1\leftarrow Parent2$  3:Self-adaptive crossover $Child1$, $Child2$  4:Self-adaptive mutation $Child1$  5:Self-adaptive mutation $Child2$  6:return$Child1,Child2$