story: Michelle's dog had puppies. One puppy was brown with a black mask on her face, like a brown panda. When Michelle's dad said she could keep her, Panda became her name. As Panda grew, over time her mask faded away. When asked about her name, she smiled because it was their secret.
 selected sentence: As Panda grew, over time her mask faded away.
Panda's mask fades >Causes/Enables> Panda's mask disappears