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

<contact_type-sing-neutral>

<contact_type-point_id_type_none-sing-neutral> <air_formation_mod>

<contact_type>

<contact_type-point_id_type_none> <air_formation_mod>

<contact_type-point_id_type_none>

<contact_type-point_id_type_none> <air_formation_mod>

<contact_type-pl-neutral>

<contact_type-point_id_type_none-pl-neutral> <air_formation_mod>

<contact_type-point_id_type_none-pl-neutral>

<contact_type-point_id_type_none-pl-neutral> <air_formation_mod>

<contact_type-point_id_type_none-sing-neutral>

<contact_type-point_id_type_none-sing-neutral> <air_formation_mod>