You have heard many times the caste system of India: brahmana, ksatriya, vaisya, sudra. This is not artificial. It is natural. In any society you go, not only in India, in any other country, these four classes of men are there: 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.