serve no other purpose than to call attention to themselves 
(ROOT (S (VP (VB serve) (NP (NP (DT no) (JJ other) (NN purpose)) (SBAR (IN than) (S (VP (TO to) (VP (VB call) (NP (NN attention)) (PP (IN to) (NP (PRP themselves)))))))))))
(ROOT (S (VP (VB ) (NP (NP (DT ) (JJ ) (NN )) (SBAR (IN ) (S (VP (TO ) (VP (VB ) (NP (NN )) (PP (IN ) (NP (PRP )))))))))))