Note that in ZA detection rules, we employ the rule 1 to detect omitted cases as ZA candidates, and the rule 2 is an exceptional case which a verb appears in the initial position of an utterance but the verb is an intransitive verb tagged as VA or VH.
they are not constrained by features of any previous utterance in the discourse segment (DS), and the elements of CI(U") are partially ordered to reflect relative prominence in U,,.