Now there was a girl who's known as The Impossible Girl
Now the Doctor saw her though out all of time and space
When we first met her job was to be a governess
Now the mystery about her is why was  she there though all of time
When the doctor goes to Trenzalore
We find out why she's known as The Impossible Girl
The mystery about her is that she was born to save the Doctor
We find out when she saids 'I'm Clara Oswald. I'm The Impossible Girl. I Was Born To Save The Doctor."