I solved it, thanks, but really some thoughts here gave me a headway on solving some other problems :-)

I also do not buy the idea that the solution requires the array to be sorted in a particular form

There is something either wrong with the test suite, or the websites test engine:

words = {
  life:   %w{ vida vie Leben },
  death:  %w{ muerte mort Tode }
}

Test.expect([], possibilities(words))

is passing this shouldn't occur, as my code is not returning an empty array

Thanks, I do understand, I guess my annoyance was a result of me thinking I have the right piece of code and some test are still failing :-) but I do also feel that there should be a way to identify which or what test are failing so we can make them pass (which of course should be after a set of criteria has been met).

@ineiti I can't find any JulianNicholis answer, same as I can't read my comments, says I need 250kyu to do so, I sincerely do feel this should be less than a game and more like an opportunity to learn, hiding the test in one way makes sense, but when I pass 6 or more test and can't find why one is passing then it defeats the purpose

Whoever hid my comment should at least show what's wrong with my code, how do I learn when I can't figure why the test is breaking