The first line of the Ballad of Mulan is 'Click-clack, click-clack'.
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Also called 《木兰诗》. An anonymous ballad of the 5th or 6th century, it was collected in the 《乐府诗集》. Its last lines, about a running buck and doe that no one can tell apart, gave the idiom 扑朔迷离. Disney's Mulan (1998) is based on it.