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4(.5)^3+4(.5)^4+4(.5)^5+4(.5)^6+4(.5)^7+4(.5)^8+4(.5)^9+4(.5)^10+4(.5)^11
4(.5)^3+4(.5)^4+4(.5)^5+4(.5)^6+4(.5)^7+4(.5)^8+4(.5)^9+4(.5)^10+4(.5)^11
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