See the legend in action here...........

http://www.google.com.ng/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CCkQtwIwAA&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DiQsjLqLWIn0&ei=qnXcUuecN5DI0AW204DoCA&usg=AFQjCNFrF69jUJInqAStzp1FI7gMzk5ffw&sig2=kig1oC3h4gSy2kZ85xaYKw