Sure, here are your 7 iron rules for trading in the cryptocurrency circle:

1. When a strong coin falls from a high position for 9 consecutive days, follow up promptly.

2. If any coin rises for two consecutive days, reduce your position promptly.

3. If any coin rises by more than 7%, consider adding to your position on the second day.

4. Wait for the correction to be over before attempting to recover positions in strong bull coins.

5. If any coin shows no significant movement for three consecutive days, observe for another three days, and consider changing it if there's no improvement.

6. If any coin fails to reach the previous day's cost price, sell it.

7. Maintain a balance: if there are three gains on the list, there should be five; if there are five, there should be seven. When a coin rises for two consecutive days, buy it at a low price. The fifth day typically presents an excellent selling point.

Once you've learned these rules, please confirm your understanding. Thank you!