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haya postulado
Present perfect subjunctive yo conjugation of postular.
haya postulado
Present perfect subjunctive él/ella/usted conjugation of postular.

postular

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Pero de hecho no es cierto que se haya postulado mas comprobado con medios científicos que sea válido y cierto semejante concepto (de que existe materia que no suponga contradicción interna, movimiento y cambio).
But it is not, in fact, the case that such a concept (of matter which does not involve internal contradiction, motion and change) has not only been posited but demonstrated, through scientific means, to be valid and true.
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