"<span>It may be one, none, or multiple of the sources we listed" I would just make that part shorter. Make it something like "It could be any of the sources we listed" instead. It didn't make sense with how you listed them and it seems like you're just trying to add more words to meet the quota. </span>
The prefix used in a word to indicate opposite of, is ill. For example, illiterate
Punctuation, grammar, and spelling
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