Changes
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if self._improvements._products[product]._ships[true] then
if self._improvements._products[product]._ships[true] then
table.insert(self._ships_keys[product], 1, true)
table.insert(self._ships_keys[product], 1, true)
elseif self._improvements._products[product]._ships[false] then
table.insert(self._ships_keys[product], 1, false)
end
end
end
end