Mahabharata 8.28.6

समं च विषमं चैव रथिनश्च बलाबलम्श्रमः खेदश्च सततं हयानां रथिना सह

samaṃ ca viṣamaṃ caiva rathinaśca balābalamśramaḥ khedaśca satataṃ hayānāṃ rathinā saha

Our plain-language meaning of this verse is waiting for scholar review.