The third chapter holds the conjugation rules for building verbs that have an irregular verb-ending. All verbs, for example, that end on "durre" are built following the rules of the entry ~durre.
Irregular verb-endings:
also see:
Chapter 1: General Information
Chapter 2: The regular verbs
Chapter 3: The irregular verb-endings
Chapter 4: The irregular verbs
Chapter 5: Appendix