Maybe a little bit similar... But this was the condition I was asked about during the technical interview, so I decided to add it. It is a bit similar in terms of the condition, but the logic of returning the result and finding it is slightly different

You're right, thanks for the correction

The order of characters in the returned list should be based on their first appearance in the string.

seemingly contradicts the last example

find_similar("AaBbCc", 2)  # Returns ['a', 'b', 'c']

Case insensitivity does not mean we can't have case preservation.

What is wrong with it?