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I'm having a lot of trouble understanding what this means (bolded):
What does 何も無かったり、あったり mean?
This is from a song.
This seems to be from 初音ミクの終焉.
It's not past tense (ta-form), but it's tari-form used to list two or more verbs and i-adjectives. So 「何も無かったり、有ったり」 roughly means "sometimes there is nothing, sometimes there is something" or "there may or may not be something".
Required, but never shown