With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Tablets
from
the
sixth-century
BC
reigns
of
Cyrus
the
Great
and
Cambyses
II
indicate
these
dates
were
sometimes
approximate
.
Tablets:O
from:O
the:O
sixth-century:O
BC:O
reigns:O
of:O
Cyrus:person-politician
the:person-politician
Great:person-politician
and:O
Cambyses:person-politician
II:person-politician
indicate:O
these:O
dates:O
were:O
sometimes:O
approximate:O
.:O