If you go to purchase some medicine, the shopkeeper may say, "Now, here is a medicine equal to this medicine, and its price is less." So no sane man will purchase. "Why I shall purchase the imitation for being less price? Give me the original": Revision history
Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.