Ten in the bed
There were ten in the bed and the little one said:
Roll over, roll over!
So they all rolled over and one fell out,
There were nine in the bed and the little one said:
Roll over, roll over!
So they all rolled over and one fell out,
There were eight in the bed and the little one said:
Roll over, roll over!
So they all rolled over and one fell out,
数量每次递减一个!