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Following the unification of Nepal in the late 18th century, members of the ruling families received land grants in the Terai and were entitled to collect revenue from those who cultivated the land. Tharu people became bonded labourers, a system also known as Kamaiya. In 1854, Jung Bahadur Rana enforced the so-called "Muluki Ain", a General Code, in which both Hindu and non-Hindu castes were classified based on their habits of food and drink. Tharu people were categorized as "Paani Chalne Masinya Matwali" (touchable enslavable alcohol drinking group) together with several other ethnic minorities.