Syed Ahmed Dehlavi, a 19th-century lexicographer who compiled the "Farhang-e-Asifiya" Urdu dictionary, estimated that 75% of Urdu words have their etymological roots in Sanskrit and Prakrit, and approximately 99% of Urdu verbs have their roots in Sanskrit and Prakrit. Urdu has borrowed words from Persian and to a lesser extent, Arabic through Persian, to the extent of about 25% to 30% of Urdu's vocabulary. A table illustrated by the linguist Afroz Taj of the University of North Carolina at Chapel Hill likewise illustrates the amount of Persian loanwords to native Sanskrit-derived words in literary Urdu as comprising a 1:3 ratio.