Short position: enter the market, open a new position and sell.

Long position closing: sell long warehouse receipts and close positions.

Short position: buy and close short warehouse receipts and withdraw from the market.

Bilateral opening: both bulls and bears enter the market to open positions at the same time.

Bilateral liquidation: both bulls and bears close their positions at the same time and withdraw from the market.

Bilateral change of hands: when there are long positions, there are long positions and delisting, and at the same time there are short positions.

When the market opens, there are empty positions to withdraw from the market.