Nuclear motion in molecules is generally a coupled anharmonic motion involving stretches, bends, torsions and inversions along chemical bonds, hydrogen bond or van-der-Waals interactions. Torsional degrees of freedom contribute the lion's share of some R to anharmonic entropy corrections. On the one hand, anharmonic corrections present in (similar) reactants and products partially cancel out when computing reaction equilibria; on the other hand, these corrections dominate interactions showing up in complex formation or transition states and are then called transitional modes. These may have a large influence on thermochemistry and kinetics. Coupled torsional modes therefore play a great role for systems where hydrogen bonding is prominent, for example in the case of alcohol clusters and biofuel combustion. However, generating a completely coupled torsional scan is near to impossible due to the "curse of dimensionality". According to the "curse of dimensionality", evenly-spaced grids of N calculations that may be feasible when treating a single dimension require N M calculations for M coupled dimensions.