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What is the best way to correct this run-on sentence?
The island will vanish in the fog it can be very thick.
The island will vanish in the fog. It can be very thick.
The island will vanish, in the fog, it can be very thick.
The island will vanish. In the fog it can be very thick.
The island will vanish in the fog, it can be very thick.
The island will vanish in the fog. It can be very thick.