The rules that use the category "<path_prep>" are:

<mine_detection_command-gapsout_null-gapsin_null>

<mine_detection_command-gapsout_null-gapsin_null-not_located> <path_prep> <line_loc-gapsout_null-gapsin_null>

<breach_mod-gapsout_null-gapsin_np_gap>

<path_prep>

<breach_mod-gapsout_np_gap-gapsin_np_gap>

<path_prep> <line_loc-gapsout_np_gap-gapsin_np_gap>

<assault_command>

<assault_command> <path_prep> <line_loc-gapsout_null-gapsin_null>

<move_mod-gapsout_null-gapsin_np_gap-not_compass_direction>

<path_prep>

<move_mod-gapsout_pp_gap-gapsin_pp_gap-not_compass_direction>

<path_prep> <line_loc-gapsout_pp_gap-gapsin_pp_gap>

<mine_detection_command-gapsout_null-gapsin_np_gap>

<mine_detection_command-gapsout_np_gap-gapsin_np_gap-not_located> <path_prep>

<move_mod-gapsout_null-gapsin_null-not_compass_direction>

<path_prep> <line_loc-gapsout_null-gapsin_null>

<move_mod-gapsout_np_gap-gapsin_np_gap-not_compass_direction>

<path_prep> <line_loc-gapsout_np_gap-gapsin_np_gap>

<breach_mod-gapsout_null-gapsin_null>

<path_prep> <line_loc-gapsout_null-gapsin_null>