what does this say = 不成文規定
I have a song that's titled this and i just want to know what it's called

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unwritten provision

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unwritten regulations
informal regulations

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Unwritten/implicit rules

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it's kinda like laws/rules that are not written on official paper. mostly accepted by the society

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Are you surea song titled with this,that's odd.The meaning in china is a rule or tradition without approval or is illegitimate