story: Two friends were painting their bedroom. First they had to paint all of the edges of the room. Then, they used paint rollers to cover the walls. After that, they put on a final finishing coat. When they were done, the room was a nice yellow color.
 selected sentence: First they had to paint all of the edges of the room.
Two friends are painting their bedroom >Causes/Enables> The friends have to paint all of the edges of the room first