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 ":".
Excavation
inside
the
enclosure
revealed
a
variety
of
buildings
,
including
post
houses
,
pit
dwellings
,
hearths
,
and
storage
units
built
on
stilts
.
Excavation:O
inside:O
the:O
enclosure:O
revealed:O
a:O
variety:O
of:O
buildings:O
,:O
including:O
post:O
houses:O
,:O
pit:O
dwellings:O
,:O
hearths:O
,:O
and:O
storage:O
units:O
built:O
on:O
stilts:O
.:O