Below is a comprehensive list of links to discussion of passages categorized by type of addition:
A-ART (addition of an article, pronoun, or possessive):
Matt 4:4 ανθρωπος
Matt 5:39 την δεξιαν σιαγονα
Matt 7:21 ουρανοις
Matt 7:29 γραμματεις (also categorized under A-NOUN)
A-CLAUSE (addition of a phrase, clause, or longer expression):
A-CONJ (addition of a conjunction):
Matt 6:1 προσεχετε
Matt 7:10 και
A-NOUN (addition of a noun or adjective including an accompanying article or conjunction):
Matt 3:6 Ιορδανη
Matt 3:11 αγιω
Matt 7:29 γραμματεις (also categorized under A-ART)
A-PREP (addition of a preposition):
Matt 4:23 περιηγεν ολην την Γαλιλαιαν ο Ιησους (also categorized under O-NAME)