Coordinations nested in other coordinations
In case of multiple coordinations, the transformation of bouquets into chains in the direction UD to SUD sometimes results in the loss of information on nested coordinations, and it is no longer possible to find them in the opposite transformation.
Example: UD_French-GSD, fr-ud-train_02697 - s'ils n'espéraient pas en faire une monnaie d'échange avec la France et, accessoirement, le Mali et la Mauritanie.