 According to Bengali linguist Munier Chowdhury, there are about nine graphemes that are the most frequent in Bengali texts, shown with its percentage of appearance in the adjacent table.In the script, clusters of consonants are represented by different and sometimes quite irregular forms; thus, learning to read is complicated by the sheer size of the full set of letters and letter combinations, numbering about 350.While efforts at standardising the alphabet for the Bengali language continue in such notable centres as the Bangla Academy at Dhaka (Bangladesh) and the Pôshchimbônggô Bangla Akademi at Kolkata (West Bengal, India), it is still not quite uniform yet, as many people continue to use various archaic forms of letters, resulting in concurrent forms for the same sounds.