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A heretic is someone who does or believes things that oppose commonly or generally accepted beliefs.
An agnostic is a person who believes that it is impossible to know conclusively whether or not God exists; an agnostic can be doubtful about other things as well.
A pandemic disease is a far-reaching epidemic that affects people in a very wide geographic area.
Something that happens which is tragic is very terrible, deadly, or extremely sad in some way.
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