With no explanation, label each line with "O", "other-chemicalthing", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Heating
of
the
solution
generates
hydroxide
ions
from
the
hydrolysis
of
urea
.
Heating:O
of:O
the:O
solution:O
generates:O
hydroxide:other-chemicalthing
ions:O
from:O
the:O
hydrolysis:O
of:O
urea:other-biologything
.:O