This fragment (ch23_rusnoms.dtr) is discussed in chapter 2 and chapter 3, and is modified later as part of the account of derivation in chapter 7. It accounts for the first 1500 noun lexemes in Zasorina's (1977) frequency dictionary. As it is an account of inflection, we have not linked lexemes which have a clear derivational relationship (e.g. brat and bratstvo), but the modifications for derivation in chapter 7 would allow this kind of relationship to be expressed.