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coefficient of x^7 in (x^7+x^6+x^5+x^4+x^3+x^2+x+1)^4(x^6+x^5+x^4+x^3+x^2+x+1)^3(x^4+x^3+x^2+x+1)^4 (x^3+x^2+x+1) (x^2+x+1)^10 (x+1)^5
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