回答
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There are some designs of dragons differentiated by their ranks. Dragons with five fingers is the highest rank, and nobody is allowed to use the design except the Emperor.
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Each design of dragons is correspond to the rank. Dragons with five fingers is the highest rank, and nobody but the Emperor is allowed to use the design.
differentiated by 〜 〜によって識別される
be allowed to 〜 〜することが許される
correspond to 〜 〜に対応する
nobody but 〜 〜以外は誰も・・・ない