const math/rand.rn

4 uses

	math/rand (current package)
		normal.go#L20: 	rn = 3.442619855899
		normal.go#L50: 				x = -math.Log(r.Float64()) * (1.0 / rn)
		normal.go#L57: 				return rn + x
		normal.go#L59: 			return -rn - x

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