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The program initially assigned each film one of four ratings: G (general audiences, without restrictions), M (mature audiences, parental guidance advised), R (restricted audiences, no one younger than 18 admitted without a parent or guardian), and X (no one younger than 18 admitted). The age limit may be adjusted by individual state rulings. M was eventually supplanted by PG (parental guidance suggested), PG-13, was introduced for films that might contain material inappropriate for pre-teenagers, and NC-17 replaced X, which had become associated with pornographic films.
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