Het x Het =?

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The eggs have a 25% chance of being a visual, 25% chance of being normal, and 50% chance of being het.

Yes, but the 66% refers to the fact that of the 75% that are not visual, they have a 66% chance of being het. Yes, once proven, they are hets, but until they are, they mathematically have a 2-in-3 chance of being het, which aren't bad odds for breeders with space and a visual morph to pair them with.