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local maxima (1-x-y)^0.2491*(1+x-y)^0.2809*(1-x+1.5y)^0.2209*(1+x+1.5y)^0.2941
local maxima (1-x-y)^0.2491*(1+x-y)^0.2809*(1-x+1.5y)^0.2209*(1+x+1.5y)^0.2941
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