where 100 000 is a coefficient to avoid excessively small numbers, and the values of A low reaction probability from the polymer to isolated B1O3, B2O5, and B3O7 was observed in the a-La30 glass. Frequent reactions of polymers between those with and without a 3-ring were observed in all systems. In a-La50, this reaction can also be seen in the video attached in the Supporting Information (chain-ring.mp4), in which polymers with and without 3-rings are depicted with yellow and red bars, respectively, at each time step. The formation and destruction of units with 3-rings is achieved by the mutual reaction between B 3 and B 4 .