A sales letter is just like a salesman that works 24 hours a day, 7 days a week.
Its job is to sell your products.
To do that, so you are highly successful, the sales “gods” have passed down to us through the decades and centuries some “can’t fail” methods.
These methods were put together in a classic marketing principle around 1925 and I am amazed how many copywriters still don’t know about it; those are the ones struggling 
Anyway, like any salesman, a sales letter should follow this long time marketing principle called…
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