Continuance and performance of a contract is important in Iranian law. and legislator in Iran has emphasized on it in several cases. Though complete performance is the aim of concluding a contract. when for any reasons it is not possible and some part of conclusion is not performed. https://www.roneverhart.com/FlasKap-Madic-Liquor-Lid-for-Large-Tumblers-9-ounce-Color-Options/