yeah, try doing it in nasm and check how easy it is

Fixed.

except that this is a list of cables, not a set, so can use dulicates only if they all are in the list.

1. I agree, but it's beginner kata. Could it be more challenging? Yes. Is it too easy to even 8kyu? Perhaps, everything is in the eyes of beholder :)
2. If that is changed now, it would break all solutions so far so I left it as it it.
3. Added more test cases.

Not an issue

Thanks!
I can't see your solution so I guess you haven't finished the kata (or was it not in JS)? So once done you should be able to view the test cases. I double checked and JS, ruby and python include one section for "The funny guy"