R and D expenses were $36,000,000 $5,000,000 lower than the Q4 of 2022 and mainly due to the decrease in stock comp and share based compensation of RMB 8,000,000 and partially offset by the increase in design and testing expenses of new model, which has been and will be launched in 2024 of RMB 3,000,000. G and A expenses were RMB 19,000,000, dollars 28,000,000 lower on an annual basis, mainly caused by the decrease in provision for credit office of RMB22 1,000,000 and the decrease in stock related costs of RMB5 1,000,000. For the full year 2023, the OpEx was RMB 891,000,000, 15% higher than 2022, and the increase was mainly due to the provision for credit losses of RMB114,000,000 and the increased promotional activities and rental expenses in overseas markets of RMB 101,000,000 partially offset by RMB 45,000,000 decrease in G and A and also $40,000,000 decrease in domestic marketing and promotions. Despite prudently raising provision for credit losses on overdue payments, we retain a positive outlook on future receivables collection, given our current partners' robust financial spending and their ongoing payments continuously. Exclude the non cash expenses, such as the provisions for credit losses, depreciation and amortization and share rate compensation, the OpEx increased 2% year over year.