Age Analyses by Simultaneous Equation Solutions
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Age Analysis of Levi Blackard (all 4 agree)
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1800 Guilford NC census        10 to 16 years    1784-1790
1810 Barren KY Census        16 to 26     1784-1794
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                                                1784-1790
1820 Lawrence TN Census         26 to 45 years  1785-1794
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                                                1785-1790
1840 Giles TN Census            50 to 60        1780-1790
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                                                1785-1790


Age Analysis of Branch Blackard (inconsistant ages-1810 Barren doesnt match other 2)
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1800 Guilford NC census        10 to 16 years    1784-1790
1810 Barren KY Census        10 to 16 years    1794-1800 (doesnt agree)
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                                                no solution

1800 Guilford NC census        10 to 16 years    1784-1790
1820 Lawrence TN census         26 to 45 years  1785-1794
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                                                1785-1790

1810 Barren KY Census        10 to 16 years    1794-1800
1820 Lawrence TN Census         26 to 45 years  1785-1794
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                                                1794-1794 (doesnt agree)

                                SOLUTION #2     1785-1790
                        after Levi = no earlier than 1785
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                                                1785-1790


Age Analysis of Eli Blackard (all 3 agree)
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1800 Guilford County census    under 10 years    1790-1800
1810 Barren KY Census        16 to 26        1784-1794
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                                                1790-1794
1820 Stewart County census      26 to 45 years  1785-1794
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                                                1790-1794
                      after Branch = no earlier than 1785
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                                                1790-1794

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SIMULTANEOUS SOLUTIONS:

ELI      1790-1794
BRANCH   1785-1790 (1810 Barren KY Census incorrect)
LEVI     1785-1790