I didn't want to correct you 'cause I knew you'd see the slip!! LOL!!
However, its generally considered that if there were only normals in the whole clutch (not likely, but could happen) that any normal from a het x het would be 50%. The reason for the 66% or 67% is because if you take 4 animals and 1 is albino, that only leaves 3 animals left. If 2 of those 3 are het, then that's a 66% chance of getting a het.
But as we all know, its just odds. And with snake breeding, always count on the worst odds, ha ha!!