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 ":".
Urease
inhibitors
are
used
to
slow
the
hydrolytic
conversion
of
urea
into
ammonia
,
which
is
prone
to
evaporation
as
well
as
nitrification
.
Urease:other-chemicalthing
inhibitors:other-chemicalthing
are:O
used:O
to:O
slow:O
the:O
hydrolytic:O
conversion:O
of:O
urea:O
into:O
ammonia:O
,:O
which:O
is:O
prone:O
to:O
evaporation:O
as:O
well:O
as:O
nitrification:O
.:O