after an 88-minute rip-off of the rock 
(ROOT (PP (IN after) (NP (NP (DT an) (NML (CD 88) (HYPH -) (NN minute)) (NN rip) (HYPH -) (IN off)) (PP (IN of) (NP (DT the) (NN rock))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NML (CD ) (HYPH ) (NN )) (NN ) (HYPH ) (IN )) (PP (IN ) (NP (DT ) (NN ))))))