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Sorry if this is very nooby but i'm struggling to understand something about RxJava.

I have the above methods that together check if a session is valid then login then get messages from an api. 

What I don't understand is where the correct place to subscribe to login would be?

For instance if I moved the `.subscribe()` call to `fun login()` - making the function Unit - how would that affect the stream differently to how it works now? I've tried it and it works either way but I don't know how they're different.