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In page Chinese dragon:

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The oldest known attestation of the "children of the dragon" list is found in the Shuyuan zaji (菽園雜記, Miscellaneous records from the bean garden) by Lu Rong (1436–1494); however, he noted that the list enumerates mere synonyms of various antiques, not children of a dragon.[3] The nine sons of the dragon were commemorated by the Shanghai Mint in 2012's year of the dragon with two sets of coins, one in silver, and one in brass. Each coin in the sets depicts one of the 9 sons, including an additional coin for the father dragon, which depicts the nine sons on the reverse.[4] It's also a Chinese idiom, which means among brothers each one has his good points.[citation needed]