तस्यापि द्विरथोत्तरा वृद्धिरैकविंशतिरथादिति ॥ कZ_१०.५.१८ ॥
tasyāpi dvirathottarā vṛddhiraikaviṃśatirathāditi
对于该(不规则阵形)亦然,其增量为每一步增加两辆战车,从二十一辆战车开始。
To standardize expansion of formations in predictable steps, aiding planning, command control, and proportional allocation.