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A durable and storable writing paper.
Storage, storing, stored, storable.
Yes, fuels produced from energy crops are storable.
Well, Starch is a storable carbohydrate and the fact that it's insoluble just means it will not dissolve in water.
Electricity is scale-able, from picowatts to Gigawatts; it is transmittable; it is storable; it is convertible; and it is affordable.