The following is a more Yang/male style of using the knife. It is more percussive and designed to be a bit more muscular.
If you watch closely the female style vs. the male style you will see distintive yin/yang patterns of male and female energies.
Athens, Greece seminar knife: http://www.youtube.com/watch?v=CfelZfbZnQs
Joseph T. Oliva Arriola