Zhège gùshi wánquán shì dùzhuàn de, méiyǒu rènhé yījù.
This story is completely fabricated, with no basis at all.
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history
杜撰 is said to derive from 杜默 (Dù Mò), a Northern Song poet who invented his own unorthodox style of verse. People joked that his compositions (撰) were 'Du-style' fabrications, and the term stuck for anything made up without basis.