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expand q^20 (1 + q^2.5 + q^5) (1 + q^5 + q^10) (1 + q^7.5 + q^15)
expand q^20 (1 + q^2.5 + q^5) (1 + q^5 + q^10) (1 + q^7.5 + q^15)
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