flip method
Implementation
Cube flip(int value) {
final eo = List.of(_eo);
var flipParity = 0;
for (var i = Edge.bottomRight.index - 1; i >= Edge.upRight.index; i--) {
eo[i] = value % 2;
flipParity += eo[i];
value ~/= 2;
}
eo[Edge.bottomRight.index] = (2 - flipParity % 2) % 2;
return Cube._(cp: _cp, co: _co, ep: _ep, eo: eo);
}