“…From a quantitative point of view, Fujita's USCI approach supports four methods of symmetry‐itemized enumeration of chemical compounds,24 i.e., the fixed‐point‐matrix (FPM) method,27,30 the partial‐cycle‐index (PCI) method,31 the elementary‐superposition (ES) method,32,33 and the partial‐superposition (PS) method 33. These methods have been applied to symmetry‐itemized enumerations starting from various skeletons, e.g., cage‐shaped skeletons,34 adamantane isomers,35 non‐rigid tetrahedral molecules,36 D 3h skeletons,37 D 2d skeletons,32 a dodecahedrane skeleton of I h symmetry,38 a fullerene skeleton of I h symmetry,31 imaginary transition structures for counting organic reactions,39 flexible six‐membered skeletons,40 a benzene skeleton of D 6h symmetry,41 ferrocene derivatives,42 a dumbbell skeleton of D ∞h symmetry,43 and an octahedral skeleton of O h symmetry 44,45…”