> a few letters had to be invented to write letters in Persian and Turkish that Arabic did not have (such as g or p). Both the Farsi and Urdu alphabets have co

> a few letters had to be invented to write letters in Persian and Turkish that Arabic did not have (such as g or p). Both the Farsi and Urdu alphabets have consonants for those particular sounds گ "gaf" and پ "peh". Given that a lot of Persian words were used, then it would stand to reason that they used the existing letters that were used in Persian.