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On the other hand you can use Ba komai as nothing. Example if I ask you (what happened?) You can simply say nothing-meaning “nothing happened” that’s if you seriously mean it that nothing happened or may be you are angry, you don’t want to talk about it at all. (Ba komai-nothing)
or you can just say ” that’s ok, don’t worry about it. Meaning in your statement you agreed but it’s okay you don’t want to talk about it (but this time with explanation showing that you have nothing in mind and respect).