Four blades, eight edges. Technically, left foot front outside/inside edge, back outside/inside edge, right foot fore outside/inside edge, aft outside/inside edge. It’s a rockered blade so you’re always moving very rare your middle blade stagnant.

Four blades, eight edges. Technically, left foot front outside/inside edge, back outside/inside edge, right foot fore outside/inside edge, aft outside/inside edge.

Four blades, eight edges. Technically, left foot front outside/inside back outside/inside, right foot fore outside/inside aft outside/inside.