i$)$ For L$1$ and L$2$ regular language pairs; L$1$ L$2$ defined by F$.$A$.$ and R$.$E$.$ find it$.$ Show step by step.

L$1=$ Even$-$Length strings $,$ L$2=$ Strings with an even number of a$\text{'}$s

ii$)$ For L$1$ and L$2$ regular language pairs; L$1$ L$2$ defined by F$.$A$.$ and R$.$E$.$ find it$.$ Show step by step.

L$1=$ Even$-$Length strings $,$ L$2=$ Strings with an odd number of a$\text{'}$s