The rules that use the category "<a_a_v-sing>" are:

<specific_vehicle_type-creatable-sing>

<a_a_v-sing>

<specific_vehicle_type-not_creatable-sing>

<a_a_v-sing>

<specific_vehicle_type-sing>

<a_a_v-sing>

<specific_vehicle_type-not_creatable>

<a_a_v-sing>