With no explanation, label each line with "O", "location-bodiesofwater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Most
of
the
Back
Bay
housing
area
was
under
water
.
Most:O
of:O
the:O
Back:location-bodiesofwater
Bay:location-bodiesofwater
housing:O
area:O
was:O
under:O
water:O
.:O