However, three arrangements were found with representatives from four of the five dimers, and two with representatives from three of the five dimers. A sixth exceptional arrangement shared by only DBT and DBTO is also studied here. These six sets of homologous arrangements covered four of the eight conformations of the DBF dimer, five of the seven conformations of the DBT dimer, twelve of the twenty-two conformations of the DBTO dimer, three of the five conformations of the Fluor dimer, and two of the five conformations of the MeCarb dimer. The twelve homologous arrangements under study are illustrated in Figure .