Charak Samhita
तत्रत्रिविधःपरःसम्पद्यते- प्रवरः, प्रत्यवरः, समोवा, गुणविनिक्षेपतः; नत्वेवकार्त्स्न्येन ॥१९॥
॥ Three categories of opponent॥ The opponent may be of three types – superior, inferior or equal, according to the above mentioned qualities for discussion and not all aspects.
english translation
tatratrividhaHparaHsampadyate- pravaraH, pratyavaraH, samovA, guNavinikSepataH; natvevakArtsnyena ॥19॥
hk transliteration by Sanscript