shēnshǒubùjiànwǔzhǐ
ㄕㄣ ㄕㄡˇ ㄅㄨˋ ㄐㄧㄢˋ ㄨˇ ㄓˇ
Simplified 伸手不见五指
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Keep 伸手不見五指 and it comes back until you know it.