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What does half of a nucleus next to the word horse mean?

Yu (Yu) radical: the number of strokes outside the Ma system: 2 words, the total number of strokes: 5 traditional radicals: the number of strokes outside the Ma system: 2, the total number of strokes: 12, the number of Chinese characters 86:98:CGCY:NME, the stroke sequence number: 55 154, and the four corners number: 74. Then from the horse.