can usually be traced back to the little things 
(ROOT (VP (MD can) (ADVP (RB usually)) (VP (VB be) (VP (VBN traced) (ADVP (RB back) (PP (IN to) (NP (DT the) (JJ little) (NNS things))))))))
(ROOT (VP (MD ) (ADVP (RB )) (VP (VB ) (VP (VBN ) (ADVP (RB ) (PP (IN ) (NP (DT ) (JJ ) (NNS ))))))))