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1/sqr (2 pi 5^2) exp (-(x-20)^2/(2*5^2)) + 1/sqr (2 pi 10^2) exp (-(x-100)^2/(2*10^2))
1/sqr (2 pi 5^2) exp (-(x-20)^2/(2*5^2)) + 1/sqr (2 pi 10^2) exp (-(x-100)^2/(2*10^2))
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