[android-developers] what's layout-sw680dp-w1000dp means?

Hi All,

I am research android 4.0.3 contacts code. and find some layout
directory such as layout-sw680dp-w1000dp. i know layout-sw680dp means
at least width or height is high than 680dp. but i confused about
layout-sw680dp-w1000dp. who can help explain it?
or tell me where to get related document? thanks!

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