Got it thanks. See now that avoiding duplicates only matters for output, not input; for instance aaabbbb would be valid input? ---> bababab... That was the point that was a little unclear to me, my mistake!

Please read the Kata description again. It clearly states what will be considered a vowel.

The description says something about there being equal number of vowels and consonants...

shouldnt this be ordered alphabetically

when i run the test it assumes "e" as if it is the 2nd letter on the alphabet
i got this:
Expected: 'edorur', instead got: 'deroru'
Expected: 'ebefegikilimomonupupuqusuw', instead got: 'befegekilimimonopupuqusuwu'

and some more like that