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On the other hand, a parasitical component F is necessarily contained in L: if P [member of] F \ L, through P there passes a focal line l [subset] F, which is necessarily k-secant X, with k > N - 1.
We have to consider the reflectivity of the surface, the accuracy of the surface and then aiming all of the light into the narrow focal line of the receiver tube.
The fourteenth line, which is the midpoint and the focal line of the poem, reads literally, "smiling with [respect to your] immortal face.