Rule 10, for example, models, as stated in the list that follows, how verbs of the type "a cânta" (to sing) conjugate in the indicative present, by having the first regular expression model the first person singular form "(eu) cânt" (in regular expression format:ˆ(.+)$), the second, model the second person singular form "(tu) cânţi" (ˆ(.+)ţi$), the third, model the third person singular form "(ei) cântȃ" (ˆ(.+)ȃ$), and so forth.
rule 10 catches the alternation t→ţ for the 2nd person singular, while modelling a particular type of verb class with a particular set of suffixes.