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

<action_query-system_utterance>

<np-gapsout_null-gapsin_null-wh> should <basic_nl_command-system_utterance-gapsout_null-gapsin_np_gap>

<np-gapsout_null-gapsin_null-wh> should i <system_operation-system_utterance-gapsout_null-gapsin_np_gap>

<user_dialog_command-user_response>

<np-gapsout_null-gapsin_null-wh> <aux-can> <basic_nl_command-user_response-gapsout_null-gapsin_np_gap>

<user_dialog_command-command>

<np-gapsout_null-gapsin_null-wh> <aux-can> <basic_nl_command-command-gapsout_null-gapsin_np_gap>