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in which year was pluto classified as a dwarf planet in which year pluto was considered as a dwarf planet in which year was pluto categorised as a dwarf planet in which year pluto was declared as a dwarf planet in which year pluto was reclassified as a dwarf planet in 2006 pluto was classified as a dwarf planet in which year pluto become a dwarf planet in 2006 pluto was categorized as a dwarf planet why when was pluto classified as a dwarf planet when did pluto become a dwarf planet
