( Second ( , ( ( ( ( ( new , ) ( not used ) ) , ) ( soybean oil ) ) ( ( is ( ( the ( ( most common ) source ) ) ( of biodiesel ) ) ) . ) ) ) )
(ROOT (S (ADVP (LS Second)) (, ,) (NP (NP (JJ new)) (, ,) (ADJP (RB not) (JJ used)) (, ,) (NP (NN soybean) (NN oil))) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN source)) (PP (IN of) (NP (NN biodiesel))))) (. .)))
Second, new, not used, soybean oil is the most common source of biodiesel.
(ROOT (S (NP (NNP Oil)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (RB commonly) (VBN used)) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN in) (NP (DT the) (NN world))))))) (. .)))