What type of details about henry sewell  can be gathered from the following bio?  Bio: henry sewell -lrb- 7 september 1807 -- 14 may 1879 -rrb- was a prominent 19th-century new zealand politician . he was a notable campaigner for new zealand self-government , and is generally regarded as having been the country 's first premier , having led the sewell ministry in 1856 .
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