Charak Samhita
अन्तर्वेगो बहिर्वेगो द्विविधः पुनरुच्यते। प्राकृतो वैकृतश्चैव साध्यश्चासाध्य एव च ॥३३॥
3. Antarvega (internal) and bahirvega (external) 4. prakrita (according to seasons) and vaikrita (unseasonal) 5. sadhya (curable) and asadhya (incurable)
english translation
antarvego bahirvego dvividhaH punarucyate। prAkRto vaikRtazcaiva sAdhyazcAsAdhya eva ca ॥33॥
hk transliteration by Sanscript