Rating:
Random elements of Rubik's Cube group tend to have small order (a few thousand), so we can
compule the discrete logarithm with brute force.
function dlog(g, h) {
var it = new Cube();
var l = 0n;
while (! eq(it, h)) {
l += 1n;
it = it.multiply(g);
}
return l;
}
