fingering problems than finding solutions 
(ROOT (S (S (VP (VBG fingering) (NP (NNS problems)))) (PP (IN than) (S (VP (VBG finding) (NP (NNS solutions)))))))
(ROOT (S (S (VP (VBG ) (NP (NNS )))) (PP (IN ) (S (VP (VBG ) (NP (NNS )))))))