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 ":".
Hydrofluoric
acid
is
complicated
because
its
strength
depends
on
the
concentration
owing
to
the
effects
of
homoconjugation
.
Hydrofluoric:other-chemicalthing
acid:other-chemicalthing
is:O
complicated:O
because:O
its:O
strength:O
depends:O
on:O
the:O
concentration:O
owing:O
to:O
the:O
effects:O
of:O
homoconjugation:O
.:O