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 ":".
The
youngest
eruptions
within
the
field
are
unknown
.
The:O
youngest:O
eruptions:O
within:O
the:O
field:O
are:O
unknown:O
.:O