one, remove the nails so that only on in each slat, middle top and bottom. This way the section will "rack". This is a term for meaning it will sissor and bend and go down or up a grade.
two, another option which makes for a cheap fence is to stair step each section where it looks like a stair case going down the hill.
Personally, I hate the stair case method, because it looks cheap and shows cheap skills, I would definately take the time to remove the nails and make the fence section "rack".
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