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 ":".
A
disadvantage
of
sodium
is
its
chemical
reactivity
,
which
requires
special
precautions
to
prevent
and
suppress
fires
.
A:O
disadvantage:O
of:O
sodium:other-chemicalthing
is:O
its:O
chemical:O
reactivity:O
,:O
which:O
requires:O
special:O
precautions:O
to:O
prevent:O
and:O
suppress:O
fires:O
.:O