G + R <-> RG
R <-> LR
Gt + R <-> RGt
Gd + R <-> RGd
G + LR <-> LRG
Gt + LR <-> LRGt
Gd + LR <-> LRGd
RG <-> LRG
RGt <-> LRGt
G -> Gbg + Gt
Gt -> Gd
Gbg + Gd <-> G
RG -> Gbg + RGt
LRG -> Gbg + LRGt
RGt -> RGd
LRGt -> LRGd
Gbg + RGd <-> RG
Gbg + LRGd <-> LRG
RGd <-> LRGd
Gd -> Gt
RGd -> RGt
LRGd -> LRGt