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This is a list of acts of the Parliament of Northern Ireland, from its first session in 1921 to suspension in 1972. From 1922 onwards, the short titles for these acts were distinguished from those passed by the Westminster parliament by the insertion of the bracketed words "Northern Ireland" between the word "act" and the year. Thus the Police Act (Northern Ireland) 1970 was an act passed by the Parliament of Northern Ireland, whereas the Police (Northern Ireland) Act 1998 was passed at Westminster. As with UK legislation, Northern Ireland's acts of Parliament were traditionally cited using the regnal year(s) of the parliamentary session in which they became law, though in 1954 this was retrospectively changed to calendar years beginning with 1943. Note that by convention "(N.I.)" is also added after the chapter number so as to avoid confusion with Westminster legislation.