The category "<utterance-discourse_system_utterance-mc>" can be expressed as follows:

<utterance-discourse_system_utterance-mc>

<action_description-system_utterance-fin-inv>

<action_query-system_utterance>

<alternatives_query>

<assertion-system_utterance>

<assertion-system_utterance-existence_claim> <action_query-system_utterance>

<assertion-system_utterance-existence_claim> <alternatives_query>

<np-gapsout_null-gapsin_null-not_wh_or_dummy>

<np-gapsout_null-gapsin_null-not_wh_or_gq_or_dummy>

<np-gapsout_null-gapsin_null-unit> <assertion-system_utterance>

<yes_no_utterance>

<yes_no_utterance> <assertion-system_utterance>