Mahabharata 4.52.21

अथास्य युगमेकेन चतुर्भिश्चतुरो हयान्षष्ठेन च शिरः कायाच्छरेण रथसारथेः

athāsya yugamekena caturbhiścaturo hayānṣaṣṭhena ca śiraḥ kāyācchareṇa rathasāratheḥ

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