For instance. four molecules in a three-level system: the following two conformations have the same probability 画mm 2 l--2 8 8 ======= a demonFor instance, four molecules in a three-level system: the following two conformations have the same probability. ---------l-l-------- 2 ---------l--------- 2 ---------l----------  ---------1-1-1----  ---------l---------- 0 ------------------- 0 a demon