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Mining the ocean floor for gold may someday be worthwhile, but at present, doing so is prohibitively expensive.
Mining the ocean floor for gold may someday be worthwhile
It someday may be worthwhile to mine for gold on the ocean floor
Mining for gold out of the ocean floor someday may be worthwhile
To mine the ocean floor for gold may someday be worthwhile
Mining for gold on the ocean floor may be worthwhile to do someday
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