seller fulfills the contract obligations to deliver when the goods are made available to the buyer at the wharf of the destination port. A DEQ can further specify "Duty Paid" or "Duty Unpaid." If "Duty Paid" is specified, the seller is responsible for all risks and costs, including duty, to the wharf of the destination port. If "Duty Unpaid" is specified, the buyer is to clear the goods and pay duty. Since unloading costs are included in the ocean freight charged by most ship lines. This is most often used for charter shipments.