The rules that use the category "<contact_directive>" are:
<contact_directive> <contact_type-point_id_type_none> <air_location>
<contact_directive> <contact_type-point_id_type_none> <air_location>
<contact_directive> <contact_type-point_id_type_none>
<contact_directive> <contact_type-point_id_type_none> <air_location>
<contact_directive> <contact_type-point_id_type_none>
<contact_directive> <contact_type-point_id_type_none> <air_location>