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

<specific_vehicle_type-sing>

<tank_type-sing> <tank-sing>

<vehicle_target-sing>

<tank-sing>

<specific_vehicle_type-creatable-sing>

<tank_type-sing> <tank-sing>

<specific_vehicle_type-not_creatable-sing>

<tank_type-sing> <tank-sing>

<specific_vehicle_type-not_creatable>

<tank_type-sing> <tank-sing>