The rules that use the vocabulary item "op" are:

<point_id-entry_point>

east op

north op

southwest op

<point_id-craft_landing_zone>

east op

north op

southwest op

<point_id-checkpoint>

east op

north op

southwest op

<point_id>

east op

north op

southwest op

<point_id-waypoint>

east op

north op

southwest op

<point_id-cap>

east op

north op

southwest op

<point_id-point_id_type_none>

east op

north op

southwest op

<point_id-debark_point>

east op

north op

southwest op

<point_id-embark_point>

east op

north op

southwest op

<point_id-bullseye>

east op

north op

southwest op

<point_id-coordination_point>

east op

north op

southwest op

<point_id-base_of_fire>

east op

north op

southwest op

<point_id-initial_point>

east op

north op

southwest op

<point_id-holding_point>

east op

north op

southwest op

<point_id-landing_zone>

east op

north op

southwest op

<point_id-homebase>

east op

north op

southwest op