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 ":".
It
must
be
cleaned
after
each
milk
collection
.
It:O
must:O
be:O
cleaned:O
after:O
each:O
milk:O
collection:O
.:O