The example includes this abbreviated chain segment:
حَدَّثَنَا سُفْيَانُ عَنْ عَبْدِ الرَّحْمَنِ حَدَّثَنِي بُسْرٌ قَالَ سَمِعْتُ أَبَا إِدْرِيسَ قَالَ سَمِعْتُ وَاثِلَةَ يَقُولُ سَمِعْتُ أَبَا مَرْثَدٍ
After Sufyān it names ‘Abd al-Raḥmān, Busr, Abū Idrīs, Wāthilah and Abū Marthad. Focus for now on Sufyān; the following explanation concerns that addition.
1. Ḥaddathanā: he narrated to us. Ḥaddathanī: he narrated to me. Sami‘tu: I heard. This is a chain segment, not the Hadith text.