Why is it advisable to put off a non luminous flame when not in use?

or:Why is it advisable to put off a non luminous flame when not in use?or:You're talking about a flame that you can't see. If you can't understand wh

or:Why is it advisable to put off a non luminous flame when not in use?

or:You're talking about a flame that you can't see. If you can't understand what danger that presents, you probably should not be around fire at all.

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