In the "Solo Leveling" world, there are various ranks or levels that determine a hunter's strength and capabilities. The levels are as follows:
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E-rank
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D-rank
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C-rank
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B-rank
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A-rank
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S-rank
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S+ rank
Each rank represents a higher level of skill, power, and danger in the world of "Solo Leveling." The higher the rank, the more challenging and prestigious the missions and battles become.