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 ":".
When
this
process
begins
,
there
may
be
no
or
only
vague
symptoms
.
When:O
this:O
process:O
begins:O
,:O
there:O
may:O
be:O
no:O
or:O
only:O
vague:O
symptoms:O
.:O