Rule by a Number of People
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1
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monarchy, autarchy, autocracy; monocracy (rare)
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2
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biarchy, diarchy, duumvirate, tandemocracy; binarchy (obs.)
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3
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triarchy, triumvirate; troika (Russian)
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4
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tetrarchy, quadrumvirate, quattuorvirate, quatrumvirate, quartumvirate; tetradarchy (obs.)
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5
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pentarchy, quinquevirate
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6
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sevirate, sextumvirate, sexvirate
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7
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heptarchy, septemvirate
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8
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octarchy, octovirate
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9
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novemvirate
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10
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decarchy, decemvirate
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12
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dodecarchy
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15
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quindecimvirate
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20
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vigintivirate
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100
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hecatontarchy, centumvirate; hecatarchy (obs.)
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