Here are some of the nuances of "souka":
* "I see": It can convey that you understand what someone has just said or explained.
* "Oh": It can be used to show surprise or realization.
* "Got it": It can indicate that you understand and will proceed with the information.
* "Okay": It can be used to agree or acknowledge a request.
The tone of "souka" can vary depending on the context and the way it's said. It can be neutral, polite, or even slightly surprised.