With no explanation, label each line with "O", "event-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Archaeological
evidence
of
an
animal-drawn
plough
dates
back
to
2500
BC
in
the
Indus
Valley
Civilization
.
Archaeological:event-other
evidence:O
of:O
an:O
animal-drawn:O
plough:O
dates:O
back:O
to:O
2500:O
BC:O
in:O
the:O
Indus:event-other
Valley:event-other
Civilization:event-other
.:O