With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
This
is
a
light
brown
solid
,
which
slowly
absorbs
moisture
to
form
a
blue-green
dihydrate
.
This:O
is:O
a:O
light:O
brown:O
solid:O
,:O
which:O
slowly:O
absorbs:O
moisture:O
to:O
form:O
a:O
blue-green:O
dihydrate:O
.:O