The category "<basic_nl_command-system_utterance-gapsout_null-gapsin_np_gap>" can be expressed as follows:
<unit-not_gesture-gapsout_np_gap-gapsin_np_gap-pl> <unit_command-group_subj_ok-system_utterance-gapsout_null-gapsin_np_gap>
<unit-not_gesture-gapsout_np_gap-gapsin_np_gap-sing> <unit_command-system_utterance-gapsout_null-gapsin_np_gap>