The four points in the pelvic inlet toward one of which the occiput of the baby is usually directed in case of head presentation: two sacroiliac articulations and the two iliopectineal eminences corresponding to the acetabula, six points of a compound optical system: the anterior focal point, the posterior focal point, the two principal points, and the two nodal points.
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... flaws of its litter mates, just as if they are occupying different cardinal points on a compass face. So because emotionally dogs can readily devolve and then re-evolve ...
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