With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
The
compound
owes
its
deep
color
to
the
conjugation
of
the
double
bonds
,
i.e
.
The:O
compound:O
owes:O
its:O
deep:O
color:O
to:O
the:O
conjugation:O
of:O
the:O
double:O
bonds:O
,:O
i.e:O
.:O