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致 (zhì) · 10 strokes
Phonosemantic compound. 攵 represents the meaning and 至 represents the sound.
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力 (Lì) · 2 strokes
Pictograph of a plow, which requires strength to operate.
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于 (Yú) · 3 strokes
Pictograph of a musical wind instrument with a reed, which is now written as 竽. The current meaning is a phonetic loan.