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gptkbp:generation
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eighth generation (1992–1997)
fifth generation (1973–1979)
first generation (1953–1956)
fourth generation (1967–1972)
second generation (1957–1960)
seventh generation (1987–1991)
sixth generation (1980–1986)
third generation (1961–1966)
ninth generation (1999–present)
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