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 ":".
An
example
of
a
group
1
phosphide
is
sodium
phosphide
(
Na3P
)
.
An:O
example:O
of:O
a:O
group:O
1:O
phosphide:other-chemicalthing
is:O
sodium:other-chemicalthing
phosphide:other-chemicalthing
(:O
Na3P:other-chemicalthing
):O
.:O