The embedded db-MBE(1) performs worse than for the fluoride-water clusters in the previous section, and largely underestimates the energy differences between the structural isomers. In contrast, the embedded db-MBE(2) results in the correct energetic ordering of the structural isomers and yields rather accurate energy differences. With FDE-ft embedding, the mean and maximum errors in the relative energies are reduced to 0.46 kJ/mol and 1.3 kJ/mol, respectively. The embedded db-MBE(3) slightly improves upon this and reduces these errors to 0.34 kJ/mol and 1.0 kJ/mol, respectively.