烦请老师一个个回答：
1. interest rate swap receiver是收固定，IRS的long方又是收浮动，那么long receiver interest rate swap是收固定还是收浮动呢？
2. equity return swap receiver是收equity return还是付equity return?
3. long equity return swap是收equity return还是付equity return?
4. long receiver equity return swap收equity return还是付equity return是由long决定还是由receiver决定？
