Compile a category hierarchy list from several different such hierarchies

My final goal is to create the most relevant category hierarchy steaming from several different such hierarchies.

But for a first step, being given a number of lists each containing 1 or more categories, I'd like to create a new list which contains the terms which are the most relevant across all individual lists. The categories from different lists may be the same or different, contain more or less keywords.

List1    List2    List3      => Resulting List
Categ_1  Categ_A  Categ_a       Categ_1
Categ_2  Categ_B  Categ_b       Categ_b
...      ...      ...           ...
Categ_8  Categ_X  Categ_t       Categ_5

Any ideas where to start ?

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