> Instead of memorizing 20x20 combinations, you limit yourself to a standard 10x10 table (just 25% of all combinations) Actually, 26% (55/210). You say 25% and

> Instead of memorizing 20x20 combinations, you limit yourself to a standard 10x10 table (just 25% of all combinations) Actually, 26% (55/210). You say 25% and nobody notices. You say 26% and you convey a message you understand things on a deeper level (still shallow but much, much better than no level at all). I'd pick 27%, though.