每天一個繞口令（2）

This time, you might need shorter time to make it clear and fluent!


A flea and a fly were trapped in a flue, and they tried to flee for their life. The flea said to the fly "Let's flee!" and the fly said to the flea "Let's fly!" Finally both the flea and fly managed to flee through a flaw in the flue.
[:496:]