2 circles of radius 1 are tangent to line AB so that their centers are 10 units apart. Circles C and D are put so that Circle C is tangent to the first circle of radius 1, line AB, and Circle D; and Circle D is tangent to Circle C, line AB, and the second circle of radius 1. If P is equal to the product of the radii of circles C and D, what is the range of P?
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If by range you mean the difference between the highest and lowest possible values for P, then is the answer 19 (25−6)?