| Smith, Adam, 72
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| Social contract, 71-72
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| Social institutions, in Enlightenment thought, 73-74
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| Socrates, 16
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| Solon, 112, 114, 120, 154
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| Solvitur ambulando ("it is solved by going"), 18
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| Sophists, Greek, 71
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| Sparta, lack of free speech in, 113
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| Speech, freedom of: classical antecedents for, 111-19;
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| not conceived of as inherent right at Athens, 112;
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| dilemma of, in liberal democracy, 113;
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| in English Bill of Rights, 85;
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| invented in ancient Athens, 112;
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