The purpose of this paper is to analyze rural delivery costs and compare them with city delivery costs.
( ( ( The purpose ) ( of ( this paper ) ) ) ( ( is ( to ( ( ( analyze ( rural ( delivery costs ) ) ) and ) ( ( compare them ) ( with ( city ( delivery costs ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN purpose)) (PP (IN of) (NP (DT this) (NN paper)))) (VP (VBZ is) (S (VP (TO to) (VP (VP (VB analyze) (NP (JJ rural) (NN delivery) (NNS costs))) (CC and) (VP (VB compare) (NP (PRP them)) (PP (IN with) (NP (NN city) (NN delivery) (NNS costs)))))))) (. .)))
They didn't compare the costs of rural vs city delivery.
( They ( ( ( did n't ) ( compare ( ( the costs ) ( of ( rural ( vs ( city delivery ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD did) (RB n't) (VP (VB compare) (NP (NP (DT the) (NNS costs)) (PP (IN of) (NP (JJ rural) (NN vs) (NN city) (NN delivery)))))) (. .)))