20
1:0 http://www.youtube.com/watch?v=gMXKCwH3Ny4
1:1 http://www.youtube.com/watch?v=d7yUDJ15QIU
2:1 http://www.youtube.com/watch?v=Y1e-s0M7Dec
2:2 http://www.youtube.com/watch?v=QVEM1Z1Rhx4
2:3 http://www.youtube.com/watch?v=LOcx7oi1ga4
2:4
3:4
4:4
5:4 http://www.youtube.com/watch?v=FM4Yzj5_rCU
5:5 http://www.youtube.com/watch?v=qIEzjF7G28E
1:1 http://www.youtube.com/watch?v=d7yUDJ15QIU
2:1 http://www.youtube.com/watch?v=Y1e-s0M7Dec
2:2 http://www.youtube.com/watch?v=QVEM1Z1Rhx4
2:3 http://www.youtube.com/watch?v=LOcx7oi1ga4
2:4
3:4
4:4
5:4 http://www.youtube.com/watch?v=FM4Yzj5_rCU
5:5 http://www.youtube.com/watch?v=qIEzjF7G28E