The category "<system_operation-system_utterance-gapsout_null-gapsin_np_gap>" can be expressed as follows:

<system_operation-system_utterance-gapsout_null-gapsin_np_gap>

<attach_unit_operation-gapsout_null-gapsin_np_gap>

<cancel_operation-system_utterance-gapsout_null-gapsin_np_gap>

<create_operation-gapsout_null-gapsin_np_gap>

<display_control_operation-gapsout_null-gapsin_np_gap>

<locate_operation-gapsout_null-gapsin_np_gap>

<name_operation-gapsout_null-gapsin_np_gap>