Thank you very much for your answer. I think I understand what you mean. So at this point, both LL and I at the boundary execute des_usr_var(1, ll) = des_usr_var(1, ll) + 1? And des_usr_var(1, ll) = des_usr_var(1, ll) -1 does not work?
Thank you very much for your answer. I think I understand what you mean. So at this point, both LL and I at the boundary execute des_usr_var(1, ll) = des_usr_var(1, ll) + 1? And des_usr_var(1, ll) = des_usr_var(1, ll) -1 does not work?