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who invented paper currency
when was paper currency invented
why was paper currency invented
who invented the paper money
history of paper currency
which country invented paper money
paper money currency history
who introduced paper money
how was paper money invented
paper money was invented in which country
what was the first paper currency
invention of paper money
who invented paper currency, when was paper currency invented, why was paper currency invented, who invented the paper money, history of paper currency, which country invented paper money, paper money currency history, who introduced paper money, how was paper money invented, paper money was invented in which country, what was the first paper currency, invention of paper money
