Reprinted from Simple Machines CD Teacher&#146;s Manual Simple Machines Lesson 22 See-Saw Physics Student Prerequisite Skills: Understand general concept of levers, by using levers they are already familiar with.
(they; are; T:already; familiar with) (Prerequisite; [is] Student [of]; Saw Physics)
they Prerequisite
are [is] Student [of]
T:already familiar with
Saw Physics