Given four circles: L_1,L_2,L_3,L_4 such that L_1 is tangent to L_2 at X, L_2 is tangent to L_3 at Y, L_3 is tangent to L_4 at Z and L_4 is tangent to L_1 at W. All tangencies are outside (the circles do not overlap each other other than at the points of tangency).
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