What is hexadecimal and how would you use it to memo CO during bld?
It's a numeral system of base 16. I wouldn't use it for CO since those have 3 different orientations, but I would use it for EO since there's only 2. 0 would equal correct orientation and 1 wrong orientation. A 3x3 has 12 edges so you would memorize 100111110001 for example for edges, which equals 9F1 in hexadecimal, so memorizing 9F1 would be enough to orient all edges. It's great for BLD but only if you're used to it.