Please write a letter to Keith Brown， the Purchasing Manager of ANA Enterprises. Their address is, 100 George Street, Sydney, NSW, Australia, 1.______. Tell them that we have agreed to a 4% reduction 2.______ that we originally quoted them for the supply of. 3.______. The same 4______ still apply. And the reference number on their letter is 03/5879. The letter is dated 1st February this year. Have our reply ready for me to sign 5.______, please.