The character sets of these 7 languages have little overlap except that (i) they all include common basic Latin alphabet, and (ii) both Hindi and Marathi use Devanagari script. We took the union of 7 character sets therein as the multilingual grapheme set (Section SECREF2), which contained 432 characters. 
 Question: How much of the ASR grapheme set is shared between languages?
Little overlap except common basic Latin alphabet and that Hindi and Marathi languages use same script.