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6. Furthermore, since, at this stage, it is to be prima facie concluded, that he was well conversant with Punjabi, thereupon, too, any valid signatures, as made by him thereons, does not permit him to lead any oral evidence or parole evidence, contrary to the admittedly made signatures by him, rather on the contract of sale, as the above oral evidence, or parole evidence, in denial to, or in detraction to his admittedly signaturing the contract of sale, is completely, barred by the provisions of Sections 91, and, 92 of the Indian Evidence Act.