Birchen = ER

Black = E 

Black mottled = E Black > Black mottled

Blue = E  Black > Blue

Bluepartridge = e+ Goldpartridge > Blue-goldpartridge  

Bluepartridge = e^b Goldpartridge multiple laced > Blue-goldpartridge multiple laced

Bluesilverpartridge = e+ Silverpartridge > Blue-silverpartridge

Bluesilverpartridge = e^b Silverpartridge multiple laced > Blue-silverpartridge multiple laced