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In page West Berlin:
"In 1952, West Berliners were restricted entry to East Germany proper by means of a hard-to-obtain East German permit. Free entry to East Berlin remained possible until 1961 and the building of the Wall. Berlin's underground (Untergrundbahn, U-Bahn) and Berlin's S-Bahn (a metropolitan public transit network), rebuilt after the war, continued to span all occupation sectors. Many people lived in one half of the city and had family, friends, and jobs in the other. However, the East continuously reduced the means of public transport between East and West, with private cars being a very rare privilege in the East and still a luxury in the West.[citation needed]
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