, mouthpieces , visual motifs , blanks . 
(ROOT (S (, ,) (NP (NP (NNS mouthpieces)) (, ,) (NP (JJ visual) (NNS motifs)) (, ,) (NP (NNS blanks))) (. .)))
(ROOT (S (, ) (NP (NP (NNS )) (, ) (NP (JJ ) (NNS )) (, ) (NP (NNS ))) (. )))