but manners is also polite? you don't HAVE to say you're good. most people choose to because it's better than having to explain.
you don't have to have manners if you don't want, but they're there as a social guideline so you don't get your face punched in because you pissed off the wrong person or whatever.
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Two hearts, beating as one;
Keeping time
Until they are no longer
Apart