. Their etymology takes us into distant history, where there existed the concept of "captivity" and "slavery". Note working for someone, but to work for yourself.
. Their etymology takes us to a distant history, where there the concept of "slavery" and "slavery". Notice to work for someone else, but to work for themselves.
. its etymology is taking us in the distant history, where there were no неволя» "and" slavery ". you work for someone else, and that is to work for yourself.