【正文】
b as reimbursement for the products to be delivered by party a. in case the sum to be paid by party b fails to cover the value of the longterm letters of credit opened by party a, the difference shall be made up by party b by paying that much to party a in advance, before the longterm letters of credit are due, to enable party a to reimburse on time the longterm letters of credit it opens. the payment of the longterm letters of credit opened by party a is based on party b39。39。s opening a sight letter of credit under the provisions and on its paying the advance required herein. thus, party b warrants, guarantees and covenants that it will open the letters of credit and pay the advance as provided herein