( ( ( List ( the methods ) ) ( for ( comparing ( ( ( internal and ) external ) ( training costs ) ) ) ) ) . )
(ROOT (S (VP (VB List) (NP (DT the) (NNS methods)) (PP (IN for) (S (VP (VBG comparing) (NP (ADJP (JJ internal) (CC and) (JJ external)) (NN training) (NNS costs)))))) (. .)))
List the methods for comparing internal and external training costs.
(ROOT (S (NP (NNS Amphibians)) (ADVP (RB sexually)) (VP (VB reproduce) (PP (IN through) (NP (JJ external) (CC or) (JJ internal) (NN fertilization)))) (. .)))