The rules that use the category "<np-gapsout_null-gapsin_null-not_wh_or_dummy>" are:

<alternatives_query>

do you mean <np-gapsout_null-gapsin_null-not_wh_or_dummy>

<response_utterance-discourse_command>

<np-gapsout_null-gapsin_null-not_wh_or_dummy>

<response_utterance-discourse_user_response>

<np-gapsout_null-gapsin_null-not_wh_or_dummy>

<utterance-last_state_command-discourse_user_response-mc>

<use_verb> <np-gapsout_null-gapsin_null-not_wh_or_dummy>

<wh_exclamative> about <np-gapsout_null-gapsin_null-not_wh_or_dummy>

<utterance-discourse_system_utterance-mc>

<np-gapsout_null-gapsin_null-not_wh_or_dummy>

<response_utterance-discourse_user_response-last_state_command>

<np-gapsout_null-gapsin_null-not_wh_or_dummy>