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

<cancel_operation-user_response-gapsout_null-gapsin_null>

<delete_verb> <unit-gapsout_null-gapsin_null>

<cancel_operation-command-gapsout_null-gapsin_null>

<delete_verb> <unit-gapsout_null-gapsin_null>

<development_command>

<unit-gapsout_null-gapsin_null> <debug_command>

<cancel_operation-system_utterance-gapsout_null-gapsin_null>

<delete_verb> <unit-gapsout_null-gapsin_null>

<control_measure_clause>

<unit-gapsout_null-gapsin_null> <reach_verb> <engagement_loc-gapsout_null-gapsin_null>