A Butter is Amel + Caramel.
A Butter, crossed with an Amel, would yield 100% Amels het Caramel.
A Butter, crossed with an Amel het Caramel, would yield 50% Butters and 50% Amels het Caramel.
An Amel het Caramel, crossed with an Amel het Caramel, would yield 75% Amels that are 66% poss. het Caramel and 25% Butters.