The category "<contact_command-point_id_type_none>" can be expressed as follows:
<contact_command-point_id_type_none-recursive> <contact_command_mod>
<contact_directive> <contact_type-point_id_type_none>
<contact_directive> <contact_type-point_id_type_none> <air_location>
<contact_directive-commit> <contact_directive-flight_advisory-not_commit>
<contact_directive-commit> <contact_directive-flight_advisory-not_commit> <contact_type-point_id_type_none>
<contact_directive-commit> <contact_directive-flight_advisory-not_commit> <contact_type-point_id_type_none> <air_location>
<contact_directive-flight_advisory>
<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <air_location>
<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <contact_rel> <air_location>
<contact_directive-not_flight_advisory> <air_location>
<contact_type-point_id_type_none> <air_location>
<contact_type-point_id_type_none> <contact_rel> <air_location>
<contact_type_nom-point_id_type_none> <air_location> <contact_type-point_id_type_none>