Blank rows have the same dimensions as the preceeding row, but with zero width spaces in the cells instead of text.

combinations of 100%, 600px, and auto

auto auto auto
600px 600px 600px
100% 100% 100%
auto 600px 100%
auto 600px 100%
auto 600px 100%
auto 600px 100%
100% auto 600px
600px 100% auto

combinations of 50%, 200px, and auto

auto auto auto
200px 200px 200px
50% 50% 50%
auto 200px 50%
auto 200px 50%
auto 200px 50%
auto 200px 50%
50% auto 200px
200px 50% auto