The letters in the चवर्ग (i.e. च्, छ्, ज्, झ्, ञ्) and in the टवर्ग (i.e. ट्, ट्ः, ड्, ढ्, ण्) in suffixes (प्रत्यय) are labelled इत् if they occur at the beginning of the प्रत्यय as told in the original form (उपदेश).