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Fix the one word that is used incorrectly.
i
X
Extremely
i
X
bright
i
X
lightning
i
X
flashes
i
X
known
i
X
as
i
X
sprites
i
X
occur
i
X
in
i
X
Earth's
i
X
upper

i
X
atmosphere
i
X
but
i
X
scientists
i
X
believe
i
X
that
i
X
they
i
X
may
i
X
effect
i
X
low-level
i
X
cloud

i
X
cover
ref_doc_title.

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