What type of details about philémon yang  can be gathered from the following bio?  Bio: ebua philémon yunji yang -lrb- born june 14 , 1947 -rrb- is a cameroonian politician who has been prime minister of cameroon since 30 june 2009 . previously he was assistant secretary general of the presidency , with the rank of minister , from 2004 to 2009 . he served in the government from 1975 to 1984 and was cameroon 's ambassador to canada from 1984 to 2004 .
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