Extract all Values, INCLUDING DUPLICATES, from two columns having nested Lists, in Power query

Dear v-jingzhang,

1- Thank you for your help.

2- Kindly note Applying: 

let pFillers = [Fillers] in List.Sort(List.Select([Current EE], each List.Contains(pFillers, _)))

 without specifying the current Record, It gave error, but specifying the record it Works, like this:

let pFillers = _[Fillers] in List.Sort(List.Select(_[CurrentEE], each List.Contains(pFillers, _)))).

3- Please help me understand the condition "each List.Contains(pFillers, _)" and the underscore you used in your "List.Contains(pFillers, _) refer to what Field?

4- May you explain why: "each List.Select((_[CurrentEE]), each List.Contains (_[CurrentEE], (_[Fillers])))" did not work?

Thank you

DSR