A(n) _____ line tells what the letter is about; a(n) _____ line refers the reader to the number used on previous correspondence or the order (or invoice number) that this letter is about.

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The Answer of A(n) _____ line tells what the letter is about; a(n) _____ line refers the reader to the number used on previous correspondence or the order (or invoice number) that this letter is about.

A(n) _____ Line Tells What the Letter Is About; A(n)