ākhyātum upacakrame

yat yat-whatsoever; pariksit-the King; rsabhah-the best; pandunam-in the dynasty of Pandu; anuprcchati-goes on inquiring; anupurvyena-the beginning to the end; tat-all those; sarvam-fully; akhyatum-to describe; upacakrame-he just prepared himself.