Most will thus speak Bemba and Nyanja in the Copperbelt; Nyanja is dominantly spoken in Lusaka and Eastern Zambia. English is used in official communications and is the language of choice at home among – now common – interethnic families. This evolution of languages has led to Zambian slang heard throughout Lusaka and other major cities. The majority of Zambians usually speak more than one language: the official language, English, and the most spoken language in the town or area they live in. Portuguese has been introduced as a second language into the school curriculum due to the presence of a large Portuguese-speaking Angolan community. French is commonly studied in private schools, while some secondary schools have it as an optional subject. A German course has been introduced at the University of Zambia (UNZA).