Sentences arrangement. 1. Thank you for your order of 500b/w TV sets by your letter dated 17 July. 2. I am enclosing our sales contract No.834 covering the order. I would be grateful if you would follow the usual procedure. 3. I must stress that this departure from our usual practice relates to this transaction only. 4. We have considered your proposal to pay by a 30-day letter of credit. 5. We do not usually accept time credit; however, in view of our long and mutually beneficial relationship, we are willing to make an exception this time. 6. This one-time accommodation does not set a precedent for future transactions.