Yes, you are quite right. My solution allowed duplicates. I have updated my solution and the tests. Thanks for pointing that out.

Fair point, I'll give that a go. Thanks.

I was recently asked this (https://www.codewars.com/kata/algorithms-interesting-times-in-digital-clock-display) in an interview.
I authored a Kata for it and I'm trying to get it out of Beta. I googled pretty extensively and couldn't find any other solutions for it.

Any thoughts or input would be appreciated.