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Because we somehow managed to _not_ import them for several decades/centuries before one finally slipped through, and we only have to avoid exporting them until
by fouric 8y ago
Because we somehow managed to _not_ import them for several decades/centuries before one finally slipped through, and we only have to avoid exporting them until they die out, which sounds like it would only take a few years.
- tptacek 8y agoObviously, we managed to _not_ import them during eras where travel and trade between continents was far rarer.