With no explanation, label each line with "other-disease", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
phase
may
last
from
several
months
to
several
years
,
and
there
may
be
no
symptoms
of
leukemia
.
This:O
phase:O
may:O
last:O
from:O
several:O
months:O
to:O
several:O
years:O
,:O
and:O
there:O
may:O
be:O
no:O
symptoms:O
of:O
leukemia:other-disease
.:O