To illustrate this, students should separate into pairs and conduct the following experiment (each pair of students needs one small ruler -- 
(students; conduct; the following experiment) (each pair of students; needs; one small ruler) Context(each pair of students needs,List([94, 121))):(students; should separate; into pairs)
each pair of students needs,List([94, 121))
students each pair of students students
conduct needs should separate
the following experiment
one small ruler
into pairs