The students make ramps and runways and finally make a runway through which a marble can roll nonstop.
(The students; make; ramps and runways) (The students; make; a runway through which a marble can roll nonstop; T:finally) (a marble; can roll; nonstop)
The students The students a marble
make make can roll
ramps and runways
a runway through which a marble can roll nonstop T:finally
nonstop