original: however , the mineralogy of the x-type asteroids is not known well enough to constrain this further .
simplifications: the mineralogy of the x-type asteroids is not known well enough to constrain this further . the x-type asteroid mineralogy is not well enough known to constrain . however , the mineralogy of the x-type asteroids is not known well enough to explain this further . the minerology of the x-type asteroids is not knwn well enough to contrain this further . the mineralogy of the x-type asteroids is not well known . however , the mineralogy of the x-type ateroid is not know well enough to constrain further . however , the mineralogy of the x-type asteroids is not known well enough to constrain this further . however , the mineralogy of the x-type asteroids is not known well enough to constrain this further .