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

25% and 50%

25% 50%
25% 25% 50%
25% 25% 25% 50%
25% 25% 25% 25% 50%

24% and 50%

24% 50%
24% 24% 50%
24% 24% 24% 50%
24% 24% 24% 24% 50%
24% 24% 24% 24% 24% 50%

100% and 50%

100% 50%
50% 100%

100% and auto

100% auto
auto 100%

99% and 50%

99% 50%

odd balls

45% 72%
72% 45%
72% 24%
45% 24%
45% 45% 24%
45% 45% 45% 24%
45% 45% 45% 45% 24%
72% 45% 24%
72% 45% 24% 99%