students first rolled one ball into these resting balls to see what would happen, then rolled two or three balls at a time.
(students; rolled; one ball; into these resting balls; to see what would happen; T:first) Context(students rolled,List([0, 21))):(students; rolled one ball to see; what would happen)
students rolled,List([0, 21))
students students
rolled rolled one ball to see
one ball into these resting balls to see what would happen T:first
what would happen