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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=liberal+system,liberal+principles,liberal+ideas,liberal+plan,liberal+policy,liberal+government&year_start=1750&year_end=1820&corpus=15&smoothing=3&share=&direct_url=t1;,liberal%20system;,c0;.t1;,liberal%20principles;,c0;.t1;,liberal%20ideas;,c0;.t1;,liberal%20plan;,c0;.t1;,liberal%20policy;,c0;.t1;,liberal%20government;,c0" width=900 height=500 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></iframe>
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1750
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1820
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English (2012)
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Search in Google Books
liberal system
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1750 - 1778
1779 - 1810
1811 - 1813
1814 - 1817
1818 - 1820
English
liberal principles
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1750 - 1777
1778 - 1793
1794 - 1797
1798 - 1817
1818 - 1820
English
liberal ideas
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1750 - 1775
1776 - 1789
1790 - 1791
1792 - 1817
1818 - 1820
English
liberal plan
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1750 - 1774
1775 - 1801
1802 - 1805
1806 - 1815
1816 - 1820
English
liberal policy
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1750 - 1779
1780 - 1808
1809 - 1811
1812 - 1815
1816 - 1820
English
liberal government
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1750 - 1791
1792 - 1806
1807
1808 - 1819
1820
English