Arthashastra
तस्माद् एक अन्तर अवरा आ षड् अन्तराद् इति सप्त रथाः ॥
After this model, 7 more chariots with width decreasing by one purusha successively down to a chariot of 6 purushas in width shall be constructed.
english translation
tasmAd eka antara avarA A SaD antarAd iti sapta rathAH ॥
hk transliteration by Sanscript