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I've never tried to earn revenue through sub-affiliates.
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I've tried but have never signed up any sub-affiliates.
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I've signed up sub-affiliates, but have not yet made any money from them.
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I have sub-affiliates and they contribute less than 1% of my revenue.
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I have sub-affiliates and they contribute less than 2% of my revenue.
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I have sub-affiliates and they contribute less than 3% of my revenue.
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I have sub-affiliates and they contribute less than 4% of my revenue.
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I have sub-affiliates and they contribute less than 5% of my revenue.
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I have sub-affiliates and they contribute 5% to 9% of my revenue.
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I have sub-affiliates and they contribute 10% to 14% of my revenue.
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I have sub-affiliates and they contribute 15% or more of my revenue.