Students should understand how to use a ruler as a straight-edge.
(Students; should understand; how to use a ruler as a straight-edge) Context(Students should understand,List([0, 26))):(Students; should understand to use; a ruler; as a straight-edge)
Students should understand,List([0, 26))
Students Students
should understand should understand to use
how to use a ruler as a straight-edge
a ruler as a straight-edge