Re-Map Path from Lists with Condition (C#)

Hi everyone, i'm in the middle of learning this exciting GH-C# stuffs and found some problem(s).

Well, I want to simply re-map the path of data(s) from 2 lists with condition in C# language. Both lists path was {a;b;c}, with "a" is the number of list, "b" is the variable of grouping, and "c" is the number of item in the group. List 1 and list 2 can contain the same data or not.

The condition is to present all data(s) from 2 lists with choosing the shortest count of group items as one group (if both list have some identical data). When there was a different data, then it make group itself. The path output wanted was {d;e}, with "d" is the grouping variable, and "e" for the number of item in the group.

For instance, i gave one example attached in data and data path. Also the wanted result.

Any advice? Thanks a lot :)