Number 0 = Zero = "Cirou"
Numbers 1 to 20 =
1. https://www.youtube.com/watch?v=Vr-L6q4vbWU&index=24&list=PL028565C616627F50
2. https://www.youtube.com/watch?v=Aq4UAss33qA&list=PL028565C616627F50&index=35
3. https://www.youtube.com/watch?v=ShqXL-zfLxY&list=PL028565C616627F50&index=36