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

<suppress_by_fire_command-gapsout_null-gapsin_null>

<movement_verb> <here_there_location> and <suppress_by_fire_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<movement_verb> <to_prep> <engagement_loc-gapsout_null-gapsin_null> and <suppress_by_fire_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<basic_suppress_by_fire_command-gapsout_null-gapsin_null>

<suppress_by_fire_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<assault_command>

<assault_verb> <enemy_loc-gapsout_null-gapsin_null>

<attack_by_fire_command-gapsout_null-gapsin_null>

<movement_verb> <here_there_location> and <engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<movement_verb> <here_there_location> and <plain_attack_by_fire_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<movement_verb> <to_prep> <engagement_loc-gapsout_null-gapsin_null> and <engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<movement_verb> <to_prep> <engagement_loc-gapsout_null-gapsin_null> and <plain_attack_by_fire_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<set_up_verb> <base_of_fire_phrase> <engagement_loc_mod-gapsout_null-gapsin_null> and <attack_by_fire_verb> <enemy_loc-gapsout_null-gapsin_null>

<set_up_verb> <base_of_fire_phrase> <engagement_loc_mod-gapsout_null-gapsin_null> and <engage_verb> <enemy_loc-gapsout_null-gapsin_null>

<suppressive_fire_command>

<suppressive_fire_verb> <enemy_loc-gapsout_null-gapsin_null>

<basic_attack_by_fire_command-gapsout_null-gapsin_null>

<engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<plain_attack_by_fire_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<basic_attack_by_fire_command-gapsout_np_gap-gapsin_np_gap>

<engage_verb> <enemy_loc-gapsout_null-gapsin_null> <by_fire_phrase-direct>

<open_fire_command_1>

<open_fire_verb> <on_prep> <enemy_loc-gapsout_null-gapsin_null>

<establish_base_of_fire_command-gapsout_null-gapsin_null>

<set_up_verb> <base_of_fire_phrase> <engagement_loc_mod-gapsout_null-gapsin_null> targeting <on_prep> <enemy_loc-gapsout_null-gapsin_null>