as a recording of conversations at the wal-mart checkout line 
(ROOT (PP (IN as) (NP (NP (DT a) (NN recording)) (PP (IN of) (NP (NP (NNS conversations)) (PP (IN at) (NP (DT the) (NML (NN wal) (HYPH -) (NN mart)) (NN checkout) (NN line))))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NP (NNS )) (PP (IN ) (NP (DT ) (NML (NN ) (HYPH ) (NN )) (NN ) (NN ))))))))