The category "<basic_unit_command-group_subj_ok-system_utterance-gapsout_null-gapsin_pp_gap>" can be expressed as follows:

<basic_unit_command-group_subj_ok-system_utterance-gapsout_null-gapsin_pp_gap>

<fly_command-system_utterance-gapsout_null-gapsin_pp_gap>

<follow_route_command-system_utterance-gapsout_null-gapsin_pp_gap>

<follow_unit_command-system_utterance-gapsout_null-gapsin_pp_gap>

<movement_command-system_utterance-gapsout_null-gapsin_pp_gap>

<pursue_command-system_utterance-gapsout_null-gapsin_pp_gap>

<recover_command-system_utterance-gapsout_null-gapsin_pp_gap>

<withdraw_command-system_utterance-gapsout_null-gapsin_pp_gap>