Hopefully someone can help me! I'm really confused about biomechanics!

I'll get back to my confusions later but at the moment I am doing an assignment and I don't know whether the question is just badly worded or i'm not getting it but the question says

Draw a diagram to represent the three types of levers...do you think it really means 3 diagrams or is there some way of doing a diagram showing all 3??

I don't understand

Help please???