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1-((1-P^1)*(1-P^1)*(1-P^1)) = 1
{root[1.59][122]}
1-((1-P^1)*(1-P^1)*(1-P^1)) = 1
(5.5*a)/2 = 0
1-((1-P^1)*(1-P^1)*(1-P^1)) = 0
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