We further analyzed the cycle length in the reaction center of both elementary and complex reactions, as shown in Figure and summarized in Table . In the subset of elementary reactions, comprising both Acyclic Graph with a single connected component and Single Cyclic types, we found that more than 98% of the entire "database" was of type [4], i.e., the reaction center was formed by single cycle of length 4. Six-membered cycles, i.e., type [6], accounts for 1.4% of the reactions. Similar patterns were observed in our "template library", with four-membered cycles at 64.5% and six-membered cycles at 17.2%, as depicted in Figure . Four-membered cycles are typically associated with transition states in 1,2addition reactions or non-conjugated reactions, whereas six-membered cycles are common in 1,4-addition reactions, where conjugated effects play a significant role.