With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
``
N
''
,
''
N
''
-Dimethyl-1-naphthylamine
is
an
aromatic
amine
.
``:other-chemicalthing
N:other-chemicalthing
'':other-chemicalthing
,:other-chemicalthing
'':other-chemicalthing
N:other-chemicalthing
'':other-chemicalthing
-Dimethyl-1-naphthylamine:other-chemicalthing
is:O
an:O
aromatic:O
amine:O
.:O