$BTC 67000 above also used USDC to place a short-term trade. The plan is to close around 64,900. For the long-term short position after 64,900, we will add and defend the cost in the added portion; the base position will not be moved. As long as the defense for the long-term short base position is not broken, we will temporarily operate using the USDC trading pair. Given the price difference, we will keep a redundancy buffer of 50.