Revise the following so that references refer to different points.
Three different types of postage stamp adhesives exist: one is gum arabic, the calcium salt of Arabic acid, a water soluble exudate of the acadia tree; another is dextrins, modified starches that are more water soluble than the starches from which they were derived; and the third is polyvinyl alcohols, hydrolyzed PVA resins that are water-soluble (3, 4, 8).
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