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

<specific_vehicle_type-pl>

forward area air defense ground based sensors

<area_name>

assembly area

assembly area <area_id>

<specific_vehicle_type-creatable-sing>

forward area air defense ground based sensor

<specific_vehicle_type-not_creatable-sing>

forward area air defense ground based sensor

<specific_vehicle_type-sing>

forward area air defense ground based sensor

<specific_vehicle_type-not_creatable-pl>

forward area air defense ground based sensors

<specific_vehicle_type-not_creatable>

forward area air defense ground based sensor

forward area air defense ground based sensors