Two different ML methods, both based on PIPs, were successful in fitting the dataset of energies. The fragmented-basis approach uses a PIPs basis that is the union of three bases for fragments of 24, 23 and 23 atoms. This PIPs basis has 661 Morse variables compared to 946 variables (N (N -1)/2), for the this 44-atom molecule. Perhaps a single PIPs basis would be feasible for C 14 H 30 ; but we did not pursue that. The main reason for that is it is clear that eventually a single PIP basis would not practical for large molecules. We note that a single full basis was recently applied to 21-atom aspirin and shown to be very precise and much faster than many other ML methods. Instead, we applied the fragmented-basis approach, which was reviewed above already. As noted, there are many possible ways to fragment the basis, but here we reported results using a 3-fragment basis of size 24, 23 and 23 atoms.